I tried it and the infinite population worked for me...but there *could* be some rare instance where it maybe doesn't work so i'll check on that. After toggling Control enemy on, you have to give them a command or box-select + double tap to move them. It should work. And the issue i noticed that V's manipulated units indeed do their intended damage but his clones don't do any. Will fix that. Regarding customizing enemy units, you actually can do it by setting pre spawn costumes and body glow (by selecting body target to enemy) but i agree its indirect and limited. Will surely expand it more. 