Hello, i am currently using an m11x radio, for oval racing, and want a radio i can dedicate a switch for dual rate...on /off, i can increase and decrease it with the m11, but want it to just be on / off? is possible with the m12, futaba 4pl?... etc... thanks

Im not sure with the M12 but with the M4T, I don't see a way to turn it off it would be nice to be able to do that just like my old analog Airtronics Vanguard xmitter.

there has to be others?!?!?

I believe the Spektrum DX3R and DX4R allow any switch to be assigned to any function.

Also want to say that the Futaba 4PKSR and 4PX have similar functions, too.

You could download their manuals and read more about these features to better understand how this works.