I like this idea with some caveats:
1. Changing internal fuel or ammo is reasonable.
2. If the plane you are in requires brackets for DTs or external ords, and you did not take off with them, you cannot get DTs or external ord on the hot pad.
3. If you had external ord on your previous sortie, but don't want it off the hot pad, you have to keep the brackets and live with the drag it / they cause.
4. Gun packages should not be able to be changed.
5. Not sure what is required to carry different size bombs. If it requires different setups or equipment to carry 1000 pounders vs 500 pounders, you should not be able to switch between them on the hotpad.
Basically, if it would require more than just changing the amount of something, it should not be able to be done on the hotpad.
Regards,
Hammer