As an arena person...don't want to sound like I'm betraying my own kind, but I don't see a huge problem with merging it with 1x1 other than the fact that I search a forum to see if it has it, so might miss it and not join if I don't think there is an arena. If merged stuff make it clear what's in it there's not a super huge downside from my point of view. In the thread titles could say something like [arena] or whatever specific 1x1 it is.