These feats have not been play tested yet, but I thought they were an interesting idea.

Force of Will [General]
Prerequisites: Iron Will, Base Will Save 5 or Higher
Benefit:  As a standard action you can focus your will into a field that protects you against magical harm.  Until your next turn you gain spell resistance equal to five plus your total will save (not counting conditional modifiers).

Improved Force of Will [General]
Prerequisites: Force of Will, Base Will Save 10 or Higher
Benefit: You can use Force of Will as a move action instead of a standard action.