What types of variant rules should the BRCS include, if any?

Basically - what are the Birthright-specific issues that the current rules set doesn't deal well with at all?

For instance, a variant for Elven spellcasters being more nature-oriented has been debated for a while, with a separate spell list, etc. Another example might be a "social system" - a way to mechanically show the status of characters in social terms, to aid in making courtly intrigues and the like interact a bit more with the rules.

Any ideas or thoughts on this?