I've tried looking up tutorials every where but can't seem to find one, is it even possible to change the points you are rewarded by repairing windows or when you pick up a nuke and it always gives you points after the zombies are dead?

I assume that the amount of points received when you get a nuke (default 400) can be changed in _zm_powerups.gsc

I’m not too sure but maybe the amount of points received by building a window can be edited in _zm.gsc or _zm_spawner.gsc?