Whenever me and my friend played this mod, we tried changing starting distance (so the engineer didnt have to rush to make defenses + the biter player can build up a better base) but when we did it, the biter would spawn next to the engineers body. Even if we increased it by the smallest amount it didn't work. Also please implement some sort of deleting system

A deleting system? with Unit Control you can select units ,and press the Delete key to kill the selected units one at a time, or there's another shortcut to kill all selected units (can't remember it)