EDIT: Furthermore, if your worry is ranked, it's a completely arbitrary mode/label to begin with. A pro player, if they really wanna practice, will likely set up a room to do so, or get together physically. A player that wants to play the game online period, will play either ranked or unranked. And a player that wants to play the game online with CAS only, or no CAS, will make or join the respective rooms. So I guess I don't see where your problem lies, unless you want a separate og character only ranked mode, for some reason. I can't think of a reason besides wanted that little label next to your name to be higher while eliminiating the 1% chance of fighting thunder drum trollers, or potentially "broken" hitboxes. I can't speak on the latter aspect since I don't go that deep in the game, but I had no issues with CAS aside from being disadvantaged myself occasionally from Height 1 NM/Asty.