I made a thread about this ages ago.... HTC said no.
My proposal specifically stated that no armament that was not initially loaded on the aircraft at take off could be loaded.
Instead, the level of fuel put into the aircraft at re-fuel could be selected (which seems reasonable... the techs just pour more or less fuel in) and whether or not you actually wanted to load bombs and rockets again (which would take longer to re-arm).
I thought it was a great idea... but alas, HTC do not agree.
It would be great to take 75% fuel in a 109, fly to a fight.... find that you've only got enough fuel for a short fight..... RTB and refuel with 100% instead. Perhaps a 10 second time penalty could be added or something...
Eh... it sounded pretty definite when they said no last time.