I think this feature, in the current AH MA, is not needed. However, in a CT setting, where a fighters will be up against several dozen bombers at once, killing gun positions will become a critical need for getting in to do the damage needed to actually shoot down the bomber.
The scattered bomber formations in the MA are easy kills for qualified attackers. No need to kill individual gun positions when a few well placed shots can take down an entire bomber (sometimes two) in a single pass.
A change that is probably past due, since formations have been added, is allowing bail-out from any position in a bomber. It can be frustrating for the player who is manning a gun position to try and bail out of a wingless bomber when they keep forgetting to jump to the pilot position first.
What would be even better is AUTOMATIC bail. This would prevent the mega-warping drone syndrome seen so many times when the lead plane gets a wing shot off and starts plummeting to earth. Then the drones start doing some sort of warpy-flash dance trying to stay in formation, followed by the drones either crashing, or suddenly re-appearing in level flight several hundered yards away from their death spiral postion.