I actually enjoy the early to mid Cold War era that Strike Fighters takes place in. Something I would like to see is a better ground radar and proper bomb sight for the folks that love to fly the strategic bombers. Also some flyable bombers from the get go. It'd be great to see some of the really early TU-95s like the Bear-A which was a level bomber along with the Bison and Badger and on the NATO side the Peacemaker, V Bombers and Buff/Stratojet. Also some strategic bombing campaigns to go with them as well...kind of like what we had in IL-2's bomber campaigns which were quite enjoyable.
It would be great to see aerial refueling be included too. Perhaps even the ability to startup the engines and taxi to the runway as well as someone else had suggested on here. While this game is less realistic than say DCS, a little more realism in that direction couldn't hurt :)