What about adding the ability to construct temp. Airfields?
Put in a extra load out "construction box" to be loaded into a C-47 or a M3, say 5 loads+5 loads of troops would construct the airfield and another 2 loads of troops make it operational?
First load of "construction" makes a marker on the ground for the other drops. Acks gets manned as the last drop of troops is done.
You couldīnt take a new plane from this field, only land and get it repaired, or supply it with the craft you land there. But before any other player could use "your" plane, they had to send a request to the supplying player or Squad. (like you send a request to gun). Once the supplying player/Squad gets offline, the stack is "free for all".
This would make it possible for Squads to man and operate a specific field. Anyone could land there and get repairs (change to a new plane, same as you landed). But to use another type, a request needed to be sent to the "CO" of that squad that buildt the Field (a CO would always be online, as anyone in the squad still remained online). The CO, could also "give" away the whole Field to another squad to man.
An automatic supply of GVs, to keep the defence up.