[Steve Plambeck]

That seems like a long way to go to give a figure an extra action per turn, and "control" of self for that purpose feels rather unnatural to me.

Perhaps a new spell (or talent or discipline) called "Speed Thought" or "Divide Attention" might make more sense? A thing that gives you one physical action AND one mental action per Turn. That's tampering with the Turn Sequence though, so it'll get complicated. Can I move 1/2 my MA, and attack with my weapon, and cast a spell all in one Turn? Powerful! And what order do the two actions occur in? My choice, or dictated by a rule? And does another figure get to act in-between my two actions? What if two opponents are both using this at the same time?

This could be opening a can of worms.