Putting V in with VI would mean V threads would get drowned out, at least in dead forums they sit there.
I reckon go with I-V and label well as has been done with the Writer's/Artist's forum. The rules'd have to be made clear though, plenty of spoilers crop up in thread titles as it is.
There's not much point in the move, but given the trend of getting rid of forums at the moment I don't see why not.
