I would like the option to leave the puny .303s or 7.9mms at home and just take cannons. How about it? I for one, sucky pilot that I am, have never said "Dang, sure am glad I brought 2000 round of ball ammo to use on these armored targets." The practice of removing light machineguns in favor of decreased weight/increased performance while keeping the heavy mgs or cannons seems to have been practiced in the war. If this is, in fact, the case, how about giving us the ability to dump one set of weapons while keeping the rest? Granted, it would require a slight retooling of the loadout selection screen, but it doesn't always display clearly for me on some a/c, and I'd be more than willing to accept a simple sheet on the clipboard with boxes to check if that's what it took (to prevent a lengthy array of possible armaments, displayed in rows currently), if such a step backwards were to give us greater flexability in weaponry.
Slightly drunk, wanted to post this before I forgot again. Squaddie brought it up, thought it had some merit. Flame/Agree to your hearts' content.