Create an empty GSC file called _custom_perks.gsc in %localappdata%\Plutonium\storage\iw5\scripts\

Copy and paste the following code inside the GSC file you just created.

// Call Of Duty: Modern Warfare 3

init()
{
    thread onPlayerConnect();
}

onPlayerConnect()
{
    while ( true )
    {
        level waittill( "connected", player );
        player thread onPlayerSpawned();
    }
}

onPlayerSpawned()
{
    self endon( "disconnect" );
    
    while ( true )
    {
        self waittill( "spawned_player" );
        // remove the "//" in the line below if you also want access to the dolphin dive perk
        // self setPerk( "specialty_jumpdive", true, false );
        self setPerk( "specialty_marathon", true, false );
    }
}

Additionally, create a new empty csv file called perkTable.csv in %localappdata%\Plutonium\storage\iw5\mp\

a0,b1,c2,d3,e4,f5,g6,h7,i8,j9
0,specialty_null,PERKS_NONE,specialty_ks_null,PERKS_NONE,,,,specialty_null,PERKS_NONE
1,specialty_longersprint,PERKS_LONGERSPRINT,specialty_longersprint,PERKS_DESC_LONGERSPRINT,perk1,,,specialty_fastmantle,PERKS_LONGERSPRINT_PRO
2,specialty_fastreload,PERKS_SLEIGHT_OF_HAND,specialty_fastreload,PERKS_DESC_SLEIGHT_OF_HAND,perk1,,,specialty_quickswap,PERKS_SLEIGHT_OF_HAND_PRO
3,specialty_scavenger,PERKS_SCAVENGER,specialty_scavenger,PERKS_DESC_SCAVENGER,perk1,,,specialty_extraammo,PERKS_SCAVENGER_PRO
4,specialty_blindeye,PERKS_BLINDEYE,specialty_blindeye,PERKS_DESC_BLINDEYE,perk1,,,specialty_fasterlockon,PERKS_BLINDEYE_PRO
5,specialty_paint,PERKS_PAINT,specialty_paint,PERKS_DESC_PAINT,perk1,,,specialty_paint_pro,PERKS_PAINT_PRO
6,specialty_hardline,PERKS_HARDLINE,specialty_hardline,PERKS_DESC_HARDLINE,perk2,,,specialty_rollover,PERKS_HARDLINE_PRO
7,specialty_coldblooded,PERKS_ASSASSIN,specialty_coldblooded,PERKS_DESC_ASSASSIN,perk2,,,specialty_spygame,PERKS_ASSASSIN_PRO
8,specialty_heartbreaker,PERKS_ASSASSIN,specialty_coldblooded,PERKS_DESC_HEARTBREAKER,slot_null,,,specialty_null,PERKS_NONE
9,specialty_quickdraw,PERKS_QUICKDRAW,specialty_quickdraw,PERKS_DESC_QUICKDRAW,perk2,,,specialty_fastoffhand,PERKS_QUICKDRAW_PRO
10,specialty_twoprimaries,PERKS_OVERKILL,specialty_twoprimaries,PERKS_DESC_OVERKILL,perk2,,,specialty_overkillpro,PERKS_OVERKILL_PRO
11,_specialty_blastshield,PERKS_BLASTSHIELD,specialty_blastshield,PERKS_DESC_BLASTSHIELD,perk2,,,specialty_stun_resistance,PERKS_BLASTSHIELD_PRO
12,specialty_detectexplosive,PERKS_BOMB_SQUAD,specialty_bombsquad,PERKS_DESC_BOMB_SQUAD,perk3,,,specialty_selectivehearing,PERKS_BOMB_SQUAD_PRO
13,specialty_autospot,PERKS_IRON_LUNGS,specialty_ironlungs,PERKS_DESC_IRON_LUNGS,perk3,,,specialty_holdbreath,PERKS_IRON_LUNGS_PRO
14,specialty_bulletaccuracy,PERKS_STEADY_AIM,specialty_steadyaim,PERKS_DESC_STEADY_AIM,perk3,,,specialty_fastsprintrecovery,PERKS_STEADY_AIM_PRO
15,specialty_steadyaimpro,PERKS_STEADY_AIM,specialty_steadyaim_upgrade,PERKS_DESC_STEADY_AIM,slot_null,,,specialty_null,PERKS_NONE
16,specialty_quieter,PERKS_DEADSILENCE,specialty_quieter,PERKS_DESC_DEADSILENCE,perk3,,,specialty_falldamage,PERKS_DEADSILENCE_PRO
17,specialty_stalker,PERKS_STALKER,specialty_stalker,PERKS_DESC_STALKER,perk3,,,specialty_delaymine,PERKS_STALKER_PRO
18,specialty_fastmantle,PERKS_LONGERSPRINT_PRO,specialty_longersprint_upgrade,PERKS_UPGRADE_LONGERSPRINT,upgrade1,,,specialty_null,PERKS_NONE
19,specialty_quickswap,PERKS_SLEIGHT_OF_HAND_PRO,specialty_fastreload_upgrade,PERKS_UPGRADE_SLEIGHT_OF_HAND,upgrade1,,,specialty_null,PERKS_NONE
20,specialty_extraammo,PERKS_SCAVENGER_PRO,specialty_scavenger_upgrade,PERKS_UPGRADE_SCAVENGER,upgrade1,,,specialty_null,PERKS_NONE
21,specialty_fasterlockon,PERKS_BLINDEYE_PRO,specialty_blindeye_upgrade,PERKS_UPGRADE_BLINDEYE,upgrade1,,,specialty_null,PERKS_NONE
22,specialty_armorpiercing,PERKS_BLINDEYE_PRO,specialty_blindeye_upgrade,PERKS_UPGRADE_BLINDEYE,upgrade1,,,specialty_null,PERKS_NONE
23,specialty_paint_pro,PERKS_PAINT_PRO,specialty_paint_upgrade,PERKS_UPGRADE_PAINT,upgrade1,,,specialty_null,PERKS_NONE
24,specialty_rollover,PERKS_HARDLINE_PRO,specialty_hardline_upgrade,PERKS_UPGRADE_HARDLINE,upgrade2,,,specialty_null,PERKS_NONE
25,specialty_assists,PERKS_HARDLINE_PRO,specialty_hardline_upgrade,PERKS_UPGRADE_HARDLINE,upgrade2,,,specialty_null,PERKS_NONE
26,specialty_spygame,PERKS_ASSASSIN_PRO,specialty_coldblooded_upgrade,PERKS_UPGRADE_ASSASSIN,upgrade2,,,specialty_null,PERKS_NONE
27,specialty_empimmune,PERKS_ASSASSIN_PRO,specialty_coldblooded_upgrade,PERKS_UPGRADE_ASSASSIN,upgrade2,,,specialty_null,PERKS_NONE
28,specialty_fastoffhand,PERKS_QUICKDRAW_PRO,specialty_quickdraw_upgrade,PERKS_UPGRADE_QUICKDRAW,upgrade2,,,specialty_null,PERKS_NONE
29,specialty_overkillpro,PERKS_OVERKILL_PRO,specialty_twoprimaries_upgrade,PERKS_UPGRADE_OVERKILL,upgrade2,,,specialty_null,PERKS_NONE
30,specialty_stun_resistance,PERKS_BLASTSHIELD_PRO,specialty_blastshield_upgrade,PERKS_UPGRADE_BLASTSHIELD,upgrade2,,,specialty_null,PERKS_NONE
31,specialty_holdbreath,PERKS_IRON_LUNGS_PRO,specialty_ironlungs_upgrade,PERKS_UPGRADE_IRON_LUNGS,upgrade3,,,specialty_null,PERKS_NONE
32,specialty_selectivehearing,PERKS_BOMB_SQUAD_PRO,specialty_bombsquad_upgrade,PERKS_UPGRADE_BOMB_SQUAD,upgrade3,,,specialty_null,PERKS_NONE
33,specialty_fastsprintrecovery,PERKS_STEADY_AIM_PRO,specialty_steadyaim_upgrade,PERKS_UPGRADE_STEADY_AIM,upgrade3,,,specialty_null,PERKS_NONE
34,specialty_falldamage,PERKS_DEADSILENCE_PRO,specialty_quieter_upgrade,PERKS_UPGRADE_DEADSILENCE,upgrade3,,,specialty_null,PERKS_NONE
35,specialty_delaymine,PERKS_STALKER_PRO,specialty_stalker_upgrade,PERKS_UPGRADE_STALKER,upgrade3,,,specialty_null,PERKS_NONE
36,throwingknife_mp,PERKS_KNIFETHROW,equipment_throwing_knife,PERKS_DESC_KNIFETHROW,equipment,,,specialty_null,
37,c4_mp,PERKS_C4,equipment_c4,PERKS_REMOTE_DETONATION_EXPLOSIVE,equipment,2,,specialty_null,
38,claymore_mp,PERKS_CLAYMORE,equipment_claymore,PERKS_TRIP_ACTIVATED_EXPLOSIVE,equipment,2,,specialty_null,
39,frag_grenade_mp,PERKS_FRAG_X_1,equipment_frag,PERKS_DESC_FRAG_X1,equipment,2,,specialty_null,
40,semtex_mp,PERKS_SEMTEX,equipment_semtex,PERKS_DESC_SEMTEX,equipment,,,specialty_null,
41,bouncingbetty_mp,PERKS_BOUNCINGBETTY,equipment_bouncing_betty,PERKS_DESC_BOUNCINGBETTY,equipment,,,specialty_null,
42,specialty_tacticalinsertion,PERKS_TACTICALINSERTION,equipment_flare,PERKS_DESC_TACTICALINSERTION,equipment,1,,specialty_null,
43,trophy_mp,PERKS_TROPHY,equipment_trophy,PERKS_DESC_TROPHY,equipment,1,,specialty_null,
44,smoke_grenade_mp,PERKS_SMOKE_GRENADE,equipment_smoke_grenade,PERKS_DESC_SMOKE_GRENADE,equipment,2,,specialty_null,
45,emp_grenade_mp,PERKS_EMP_GRENADE,equipment_emp_grenade,PERKS_DESC_EMP_GRENADE,equipment,2,,specialty_null,
46,flash_grenade_mp,PERKS_FLASH_GRENADE,equipment_flash_grenade,PERKS_DESC_FLASH_GRENADE,equipment,2,,specialty_null,
47,concussion_grenade_mp,PERKS_CONCUSSION_GRENADE,equipment_concussion_grenade,PERKS_DESC_CONCUSSION_GRENADE,equipment,2,,specialty_null,
48,specialty_scrambler,PERKS_SCRAMBLER_ITEM,equipment_scrambler,PERKS_DESC_SCRAMBLER_ITEM,equipment,1,,specialty_null,
49,specialty_portable_radar,PERKS_PORTABLE_RADAR_ITEM,equipment_portable_radar,PERKS_DESC_PORTABLE_RADAR_ITEM,equipment,1,,specialty_null,
50,specialty_revenge,PERKS_REVENGE,specialty_revenge,PERKS_DESC_REVENGE,perk4,5,,specialty_null,
51,specialty_grenadepulldeath,PERKS_MARTYRDOM,specialty_grenadepulldeath,PERKS_DROP_A_LIVE_GRENADE_WHEN,perk4,4,,specialty_null,
52,specialty_c4death,PERKS_C4DEATH,specialty_c4death,PERKS_DESC_C4DEATH,perk4,6,,specialty_null,
53,specialty_finalstand,PERKS_FINALSTAND,specialty_finalstand,PERKS_DESC_FINALSTAND,perk4,4,,specialty_null,
54,specialty_juiced,PERKS_JUICED,specialty_juiced,PERKS_DESC_JUICED,perk4,4,,specialty_null,
55,specialty_uav,PERKS_UAV,specialty_uav,PERKS_DESC_UAV,perk4,6,,specialty_null,
56,specialty_stopping_power,PERKS_STOPPING_POWER,specialty_stopping_power,PERKS_DESC_STOPPING_POWER,perk4,5,,specialty_null,
57,streaktype_assault,PERKS_ASSAULT,streaktype_assault,PERKS_DESC_ASSAULT,perk5,,,specialty_null,
58,streaktype_support,PERKS_SUPPORT,streaktype_support,PERKS_DESC_SUPPORT,perk5,,,specialty_null,
59,streaktype_specialist,PERKS_SPECIALIST,streaktype_specialist,PERKS_DESC_SPECIALIST,perk5,,,specialty_null,
60,specialty_bulletpenetration,PERKS_DEEP_IMPACT,specialty_bulletpenetration,PERKS_DESC_DEEP_IMPACT,proficiency,,,specialty_null,
61,specialty_marksman,PERKS_MARKSMAN,specialty_marksman,PERKS_DESC_MARKSMAN,proficiency,,,specialty_null,
62,specialty_sharp_focus,PERKS_SHARPFOCUS,specialty_sharp_focus,PERKS_DESC_SHARPFOCUS,proficiency,,,specialty_null,
63,specialty_bling,PERKS_BLING,specialty_bling,PERKS_DESC_BLING,proficiency,,,specialty_null,
64,specialty_secondarybling,PERKS_SECONDARY_BLING,specialty_bling_upgrade,PERKS_DESC_SECONDARY_BLING,slot_null,,,specialty_null,
65,specialty_pistoldeath,PERKS_LAST_STAND,specialty_pistoldeath,PERKS_PULL_OUT_YOUR_PISTOL,slot_null,,,specialty_null,
66,specialty_armorvest,PERKS_JUGGERNAUT,specialty_armorvest,PERKS_INCREASED_HEALTH,slot_null,,,specialty_null,
67,specialty_bulletdamage,PERKS_STOPPING_POWER,specialty_bulletdamage,PERKS_INCREASED_BULLET_DAMAGE,slot_null,,,specialty_null,
68,specialty_light_armor,PERKS_LIGHT_ARMOR,specialty_light_armor,PERKS_DESC_LIGHT_ARMOR,slot_null,,,specialty_null,
69,specialty_holdbreathwhileads,PERKS_HOLDBREATHWHILEADS,specialty_holdbreathwhileads,PERKS_DESC_HOLDBREATHWHILEADS,proficiency,,,specialty_null,
70,specialty_longerrange,PERKS_LONGERRANGE,specialty_longerrange,PERKS_DESC_LONGERRANGE,proficiency,,,specialty_null,
71,specialty_fastermelee,PERKS_FASTERMELEE,specialty_fastmeleerecovery,PERKS_DESC_FASTERMELEE,proficiency,,,specialty_null,
72,specialty_reducedsway,PERKS_REDUCEDSWAY,specialty_reducedsway,PERKS_DESC_REDUCEDSWAY,proficiency,,,specialty_null,
73,specialty_lightweight,PERKS_LIGHTWEIGHT,specialty_lightweight,PERKS_DESC_LIGHTWEIGHT,proficiency,,,specialty_null,
74,specialty_moredamage,PERKS_MOREDAMAGE,specialty_moredamage,PERKS_DESC_MOREDAMAGE,proficiency,,,specialty_null,
75,specialty_radarblip,,,,slot_null,,,,
76,specialty_radararrow,,,,slot_null,,,,
77,specialty_radarjuggernaut,,,,slot_null,,,,
78,specialty_marathon,PERKS_MARATHON,specialty_marathon,PERKS_DESC_MARATHON,perk1,,,specialty_fastmantle,PERKS_MARATHON_PRO
79,specialty_jumpdive,PERKS_JUMPDIVE,specialty_jumpdive,PERKS_DESC_JUMPDIVE,slot_null,,,specialty_null,
perk1,0.3333,0.4941,0.6196,,,,,,
perk2,0.5255,0.5686,0.3804,,,,,,
perk3,0.6196,0.3373,0.3373,,,,,,
perk4,1,0.5,0,,,,,,
equipment,1,0.8,0.4,,,,,,
upgrade1,1,0.8,0.4,,,,,,
upgrade2,1,0.8,0.4,,,,,,
upgrade3,1,0.8,0.4,,,,,,

Plutonium

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