I suggest giving access to rocket launchers to engineers and maybe even medics (but definitely not infiltrators). At least then as an engi or medic, I can perform support roles while detering but not killing air. Make it an ASP...you already give engineers LMGs, so why not rocket launchers. Thanks!
Long ago (probably 6-7 years, so pretty much since the game's been going), I really was hoping there'd be an AA engy turret. No such luck :/ (though the very random AV turret kill on ESFs is very satisfying)