For everyone having issues where you spawn with no gun, no ammo, and cannot use melee in Custom Maps while using this mod menu, I found a simple fix:
Navigate to your Plutonium storage folder: Plutonium/storage/t4/raw/maps/
On Linux: Plutonium should be in your Wine Prefix with the same path.
Locate the file named '_loadout.gsc' Rename it to '_loadout.gsc.bak' (this disables the script without deleting it).
Restart the game or do it while your Game is not open at all.
Why this happens (I think): The mod menu's global loadout script often conflicts with the custom weapon settings of the map. Renaming it allows the map to load its own weapons correctly while the menu still functions.
Confirmed working on March 16, 2026.