Why not make FC4 a twin seat mirror to FC3? Emphasizing on multicrew of a single plane? It can consist of tandem seat equivalents to the original planes in FC3 (of course with a few differences)
For instance:
F-15D
Su-30 (Not the Su-27UB which it normally would be)
Mig-29UB
Mig-29K (single seat I know but as an equivalent to the Su-33 and to elaborate carrier ops)
Su-30MKK (J-11A twin seat equivalent) and can carry Chinese weapons
Su-25UTG (Carrier version) Or Su-25UB(twin seat version)
.............. (Fill this void with any attack aircraft that's a twin seater which you think could mirror the awesome single seat A-10 ;) )
Just my thoughts for FC4 aircraft if possible.......
Mig-29K (carrier ops)
Su-30M2 or Su-30SM(if possible and with online multicockpit mode and TVC for the SM)
F-16A(FC3 while F-16C full fidelity)
SAAB Gripen A or Rafale F-1 (just for one European that can't make it to full fidelity)
If it was integrated into the game as an AI then it won't be mandetory, as people who download it can fly it and others will simply see them occupied by players
I'm all for this! However an F-86A would be impossible as we already have the F-86F, and it's not wise to develop different iterations of the same aircraft. However I'd love to see some straight winged jets in DCS absolutely!