About that time I pop up with my regular wishlist again:
Tracers as an option set in the hangar by aircraft/vehicle
HVARs for the B-25H
Tiny Tims!
Centerline bomb option for the F4U-1D: 500lb, 1000lb and 2000lb options (total max load of 4000lbs of bombs + 8x5"HVAR)
Double the size of the gunsight in the bubble-top F4Us (I can link my calculations to prove the point if you need it). The bottom of the sight image should come down to the top of the cowl in default head position.
Land-based option for the F4U-1A (remove the arrestor hook and wing-folding mechanism, many 1As were built this way, or modified as such in the field)
Remove the metal hood from the F4U-4's canopy right above the pilot. Most F4U-4s omitted this.