Dusty knows what he is talking about here. There are some ways you can fake a round world by moving the other players around clientside for each player, but the effect probably still wouldn't be seamless, and you would have to specially code a lot of things like projectiles to work with it as well. It's not worth the huge amount of effort it would take to implement it on a server that already has years of scripting done on it. It might be cool to put on a playerworld that was scripted from the ground up with a round world in mind.