Im just wondering if I can give spell scrolls to a henchman and make him or her learn that spell...this would be very helpful, as you come to have very powerful scrolls that may be very useful if known!

I don't think so Tyrion, but I could be wrong - usually the henchmen will just cast spells from the scrolls. It actually pays to hold onto those powerful scrolls for encounters with the big bosses

I agree. I gave my henchmen some really good spells, and they used them in some of the strangest ways, or against creatures where there was no need.