PrE based Capstones

Just an idea that I had a while ago but I figured I throw it out there and see the responce. What if for each PrE we had we had a Capstone that fit in with that PrE in addition to the choise of the normal class capstone. For example, The normal Wizard's capstone is +2 Int. and -1 sp cost on all metamagic feats, but what if they created one for Pale Master as well giving +2 Int. and made them permantly part undead.

This would act simular to the PrE's as in you could only select one and the Capstones would require the tier III of the PrE (assuming that they get them all completed to Tier III).

I've only had experience with a capped out Wizard so I don't know how the others would work however, if you all have any ideas please let me know.

Again this is just my idea

~Rakian_Knight