Resupply missions would be tough, but would also add a new dimension to the game, some other notables that'd be nice:

A) Factories in each nation dedicated to a single vehicle type; ie; kill the tank works and no panzers,osties available for 15 minutes, same with planes by type.
B)Depots with truck convoys moving from depot to nearest base, depots can't be killed,trucks can, trucks move at same pace,when all trucks are killed, a new convoy starts from the depot, these resupply and repair any damage at bases they reach.
C) Small (rifle caliber) ack at least 20 to a base, these cannot be killed by air attack, they cease firing when enemy armor roll into base, this represents local infantry forces.
D) Comand posts these are halfway between friendly and enemy bases, friendly ground vehicles can refuel and rearm from them as well as receive light AAA cover, cannot be captured until owning base falls.
F) Cruiser or DD squadrons without a CV, these could be useful in shore bombardment without risking Carriers in unnatural combat, also good for harrying enemy CV groups.
G) Landing craft, they can come with a load out of drunks or 1 GV, when you pop the GV out on shore the LC goes back to the fleet and you drive the tank.
H) mannable antiaircraft guns at fields, now this one Hitech said they're looking at implementing so I'll leave it at that.
I)Probably need a new map for this one, but
Field restrictions on planes, ie; This field has Fw's,this one F4-U's, etc,etc, (Probably the single most unpopular idea I have but who knows?)
feedback, in the real sense of the word, is wanted.
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pzvg- "5 years and I still can't shoot"