pre-setting control groups

So control groups are pretty important for dota. Control groups persist between games so it's fairly easy to just get the max number of eidolons or treants and bind them to the groups then never look at it again.

But is there an easy way for me to do this with neutral creeps? If I play enchantress or I buy helm, then I have to set the control groups every time I brainwash the creep. Is there an easy way for me to get every neutral creep bound to a key at once?