For the few previous tournaments we have used Agiel's plugin to change various XP related rewards, such as not getting survivor bonus when winning a round whilst staying alive or getting a set amount of XP for capturing the ghost instead of a whole rank up. It would be nice to able to do it natively.
(If we arent changing any XP mechanics for the whole game at the moment, then itd maybe be simpler if you could only use the related commands when a server has sv_neo_comp enabled?)