I would vote for game play.
Things that in my opinion, need attention:
1) Damage model: Be it aircraft, ships or vehicles, it needs improving.
2) Realistic gunnery models: I saw a guy lose a wing to a B-26 at 1,600 yards, that's about 600 yards beyond the effective range of an M2 BMG firing at a moving target with ring and bead sights. Do the ballistics math and add in normal bullet dispersion associated with hand aimed gun mounts and you will see that this is virtually impossible in the RW.
3) Zoom mode: Disable guns when in zoom mode. No one had telescopic gunsights unless they were trained snipers. If you're that blind, see an opthalmologist (Fluff drivers will whine about this one).
4) Triple A: Harden the field acks.
5) Why is it Buff bombs arm when dropped at 500 feet, and Jabo bombs do not? I watched a formation of B-26s drop bombs and kill a CV while at just 400 feet. I know his altitude because I was on his six shooting.
6) Fix the VOX bug that causes the constant outages.
7) Consider requiring 11 troops being the minimum for a field capture. This will cut down on the single player milkrunning of bomb VH, or kill town, auger and grab troops. If he has to make two trips, the town or VH will be up before he can return. Late-night milkrunning on the big maps is rampant.
There are other issues relating to scoring and flight models that could be mentioned as well, but the above 7 items are a good place to start.
I think game play issues are of greater importance than increasing the number and types of aircraft available.
My regards,
Widewing