If the idea is to run in the gas class you might as well run nitrous anyway. If you have a compressed air tank, running to the intake, wheather it is air or not your going to have to run in the fuel class. No means to certify air.
Dallas, I agree it would have to be a fuel class, if any class at all. Based on past 'rulings' it's doubtful that I'd be allowed to run in a class, as the compressed air for supercharging, I'm told, has been deemed a no-no.
Still, it would be worth it to run time only, just to see the HP gains possible, from not losing the parasitic losses.
As for the compressed bottles not being allowed, or not passing tech, precedent has already been set, when they allowed the French liner, and possibly others, to run. In addition to bottles, I think a specially constructed frame, certified and tested to 5000 PSI would be an air storage benefit.