I'll definitely up the Civ count for BTS, though if there actually were 34 live civs I think it might get a little insane. I haven't heard of the Modular dll, I'll look it up ...
In terms of adding civs that aren't in the vanilla game, that's something you can do with just XML editing. I highly encourage anyone who has one of these customized versions to go ahead and post it, seems like 24 or 34 civs is never enough for some people ... there's a 48 civ dll for this mod too if anyone goes that route.