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No, it's heat from the rim that damages the tube, not the increase in pressure. IIRC.
It's a topic of much debate, but discs + tandem = bit of a no no really.
@swedeee third brake leaver I think. It's a drag brake, so probably with a thumb shifter type device with no return spring.
Emergency third brake. Bit of overkill if you have V brakes but if you carrying a load of shit and both of you weigh 90kg and you are descending an alpine col then it might save you from blowing out a tube due to the rims heating up.