Hello MoChestnuts To remove the sprinting zombie it simple just go Remix2.gsc then search for this
replaceFunc( maps/mp/zombies/_zm_utility::set_run_speed, ::set_run_speed_override );
You must make this code comment to do it just put // back of the code
Like this
//replaceFunc( maps/mp/zombies/_zm_utility::set_run_speed, ::set_run_speed_override );
Now it show comment that mean this script of zombie sprint is disabled
it must be green in VSCODE
Then compile it and put in script folder
i hope your problem is fix
And sorry my english is not good i hope you understand