Thank you thank you
I would suggest Allegiances based on loose religious groupings: Storm allegiance, Solar allegiance, Malkioni allegiance, etc. These could or could not be linked to specific Runes, depending on your tastes. That would simply add colour IMHO -- the important mechanism is the allegiance mechanism itself.
PS-- As regards the other thread, the hijacked one (atheistic sorcerers v Malkioni sorcerers), there was a panel at Bacharach discussing this, and the outcome was that sorcerers should be really played as getting their spells from cold logic rather than prayer. I believe there will be something about this in an upcoming Moon Design product.