What are you talking about man? Looks like you have a warrior, and the warrior has no such rev limiter, neither forward or reverse. No rev limiter. The procoms don't change anything except the spark timing a little bit.
Turning high rpm's wont affect the transmission either, if anything high rpms will affect the motor, and nobody is going to be revving the piss out of the thing in reverse so it's a non-issue anyways. The yfm350 powerplant is one of the most durable ones ever put in a quad, it'll take a lot more than some excessive rpms to do any damage, especially on a mostly stock one.