I've suggested this before, but I'm going to revisit the subject again since it has been quite awhile:
Fuel:
First, try out the 1.5 burn rate instead of the 2.0. This would allow for higher fights, currently some of the high alt aircraft can barely reach high alt before having to RTB due to low fuel.
Then, change the fuel tanks value by allowing %50 to be the max fuel allowed with the 4th fuel depot destroyed. Currently, with #3 fuel depot destroyed it removes the drop tank availability, and #4 destroyed limits max fuel to %75. So the new system, if my wish comes true, is to remove DT with fuel depot #2 destroyed, max fuel at %75 with #3 depot destroyed, and %50 max fuel with 4 fuel depots destroyed. All airfields have at least 4 fuel depots so no changes would have to be made to the maps.
Ordnance:
This wish a really out in right field, because the small airfields would need an additional 2 ammo bunkers. Currently, it is an all or none set up.
With the second ammo bunker down, disable the 1000lb/500kg and larger bombs. With ammo bunker #4, all remaining ordnance are disabled.
Troops:
Currently, it is an all or none coding. I suggest that with the 3rd barrack being destroyed, gv supplies be disabled. With the 5th barracks destroyed then troops and field supplies are disabled.
Im a fan of the stepped system in which some damage is going to do harm to the planning and strategic outlook of a base, region, or front, etc, on a map. The way in which the fuel damage system is stepped could be used to a varying degree for the troops and ordnance as well.