Steve, I think you said one time that maybe if you held the mouse over Merlin for a second in MR3 a menu would pop around him too choose auras or foods and stuff?
you should be able to assign foods and auras to 1-10 (pushing 1 will eat chicken leg, or pushing 3 will switch you to some aura, you can choose the 1-10 thing to be whatever you want it assigned to) and you can choose what 5 spells (assuming there are more than 5 spells in the game) you want to be on the top menu where you push CTRL to go through the spells.