i believe unleashX already spoke on this.. and decided that XBMC does a 100% fine, great, dandy, beautiful job at integrating xlink kai.
if you dont use XBMC for kai reasons... then i dont know what to say. you run the engine only on your pc (only shows up in taskbar) then you browse the arenas on XBMC and find which one you want to go in.. or just go into the games general arena, click "play" and it launches the game and your choices of server pop right up.
what else do you want... leave UnleashX alone, i think its great the way it is.