For alts, I'm currently leaning towards '1 per sphere'. So major template OR minor in a sphere, but not both. Have a vamp? Want to ghoul your mortal? Pick one.
As for Mage and Changeling having multiple things? I'm not sure. Part of that hesitancy comes from there not being a lot of experience with those two spheres on mushes. Changeling is brand spanking new and mage... I only remember one short lived game that had mage on it? And that was a few years ago? Squints
That said, IF players want to make their own and get people together to do it? Come talk to us. But don't expect it to 1) be easy, icly or 2) to not get fucked with by the other factions, the co-op, or the players/npcs. Big stuff needs big story or it's hollow.
I plan on most positions of power being npc's and have plans to handpick a few as people come in and things get going (as suggested earlier in the thread. I might be looking at @Ganymede. WANNA BE A PRINCE?!)
I also have plans for npc's that can keep shit from bottlenecking in case rl eats the pcs in those positions. Rules for all of that are on my to-do list for hammering out the specifics of what is reasonable and what is not, etc.
Oh, and as a side note, cause my mind wanders a lot: staff gets xp, same as pcs, when they st stuff. Dangles bait