Please have a look at the EnhancedItems package, especially at the code of the classes in EnhancedItems.u, like PickupPlus (expands TournamentPickup), EnhancedWeapon (expands TournamentWeapon), EnhancedProjectile (expands Projectile) and EnhancedMutator (expands Mutator). Could you imagine expanding classes of your mod from these or would you prefer the original UT classes?