Regarding all of this compressor hub-bub
The intent of the rule is so that teams don't fill tanks onboard the robot without having the nasson shutoff valve controlling the compressor. This makes total sense, even if the compressor is not onboard the robot.
Using a compressor for non-robot uses (such as blowing out dust and such) should be absolutley no problem, so long as that compressor isn't used to pump up tanks onboard the robot.
A good example of this is the duct tape rule. Just because you can't use duct tape on the robot, doesnt mean you can't use it on the cart.
My 2 cents,
Jacob