Is it possible to extend ROPawn without creating a new gametype??

[IconoclastDX]

Ive been having trouble getting my extended ROPawn class (MyROPawn) into the game. Other post on the net seem to say that you cannot get a extended xPawn class into a game via a mutator and that you must use gametype. From your experience is this true? I only have one function that I want to modify in ROPawn and I thought (since this was OOP) that the easiest way would be to subclass ROPawn, rewrite the function and use a mutator to subsitute the MyROPawn for ROPawn. But Ive tried CheckReplacement, ReplaceWith and iterators and cant get the thing to budge. Am I going about this the wrong way. How hard can it be to modify one function?

Thanks in advance.