Trying to get my possessed minions to run/creep/move around at all is problematic. When I attempt to change the keyboard control settings, I can only switch Possessed Creep and Possessed Run between Shift and Ctrl. Neither of those keys do anything when I've possessed a creature (left Ctrl/Shift, right Ctrl/Shift, doesn't matter). I can attack whilst possessed, group creatures, etc. I just can't get my possessed peon to move around.

Please help! It's the funnest part of the game...