I would like a setting that would activate one of the TX relays with the PTT, but not when TUNE is selected. That would allow sending a low power signal to operate an external tuner, but not key the amp. PTT would work normally.
You do know that when you press the Tune button that is a separate power level? Why not set it for a very low level that gives just a few watts out the amp? Maybe one or two watts.. That should drop the amp output.