Something I've seen come up a lot in discussions of the new Ranked and Ranked Practice rolelist is that people don't just use Ranked Practice as practice for Ranked, but also as a rolelist that's more flexible than Classic, more balanced than the Chaos modes, and more consistent than Custom, without being as competitive as the actual Ranked mode.
I think it would be beneficial to have an additional two or three game modes with fixed rolelists that would allow for different styles of play, without having to find a Custom lobby that suits your needs. Perhaps have the old Ranked rolelist in such a mode, and for the Coven expansion, have a three faction rolelist with Town, Mafia, AND Coven. This would also allow for, say, Guardian Angel showing up outside of Custom/All Any, by having an NB/GA slot in one of these "RP alternate" game modes. A fixed rolelist that includes NC and Any could also be worth trying out. I don't feel like I'm explaining myself very well here, but I think having 2-3 additional game modes would be beneficial overall.