Sweet! It all depends on how many would choke the pipe of course. 10+ should do okay with a t1 me thinks? You can always try and test a larger value and see if it starts to bog the server down.
You know, there's already so many osp servers, I always wanted to see how a vq3 mode-only cpma server would fair. Don't think there are many of those around.
Course' you would get less players than would come to play osp (most likely) but netcode wise it would be a whole lot better...
10-12 slots should be fine for anything in the US. that's 4v4 tdm with a ref and gtv (not that any of that matters anymore)... sort of the standard. if your t1 can't handle it you can always go down to max 6 and let people 1v1 and 2v2 on it.