XP for MCs...?

Hey all! I've been away from these forums for a while, so I'm not up to date on all the latest hacks and such.

Has anyone experimented with mechanics that would allow MCs to get experience for their threats or otherwise advance their threats?

Things that "advance" a Threat should be part of that Threat's countdown (or a countdown associated with the Front to which that Threat belongs, if you're using Fronts).