In-flight refueling is already a requirement of the V-22, as is FLIR and countermeasure dispensers. Those are already on there as tactics and doctrine dictate them as a necessity. There was talk of a chin mounted gun under the nose of the V-22, but that was deemed as something that could wait until later - or something along those lines. In other words, no one's holding their breath over that happening.
You can stick a .50 cal on the tail ramp, just like on an MH-53M, but as with the CH-46, that ramp is the primary means of getting a bunch of dudes on or off in a hurry. A gun and gunner gets in the way of that, especially if litters are involved. And a ramp gunner isn't the same as a side gunner. The problem with side guns on the Osprey is the same as a Black Hawk with the HSSS system installed - you limit the gun azimuth. With the Black Hawk it's a couple of drop tanks (you can lose those), but with the Osprey, the problem is the engine nacelle. Can't dump those.
Stingers? Never heard of that. Is it safe to say that the biggest threat to an Osprey will come from below? I know that this is why all USAF and USMC aircraft these days are shades of gray - to hide against the sky from ground fire, not to hide them against the ground from enemy fighters.
Screaminhelo -
could you shoot me an e-mail please?