I think it makes all the sense separating CHN and JPN. By not doing so I believe you are alienating alot of JAP runners simply because they cannot compete when it comes to top times. Remember that all the JPN runners cannot get the CHN version due to strict copyright laws, and that the version is nearly impossible to get. A JPN player can simply not get WR with an optimized JPN version run vs an optimized CHN version run.

Good job mods for trying to include everyone :)