i could gaffertape red rotating police beacons to each roboteers head, with a Im a giant wuss button on their foreheads? Maybe some sort of chickensong to???

lol, no, not really. I think a universal emergency stop button for tap out and safety stop would be best, so we dont have unheard little, quiet voices shouting important things like...

dont hit me (then they hit you)
leave it alone (then the flip you)
its on fire... stop (then it flamethrowers you)
and
STOP THE FIGHT!!! THERE IS A SMALL CHILD INSIDE THAT ROBOT (or other similar safety concerns.)

good compromise?