The problem with 'hB' bombers (it could be any bomber, a Ju-87 for example) is that they fly too high, and on shorter missions their escort fighters have problem reaching their altitude in time. I wish the 'hB' bombers flew at altitudes specified in the concerning xxxx.planes.dat files.
As for fighters - it would be great to have groups of, for example, 30F, but there's just not enough room on the runway, where they're spawned. And when they're spawned at time intervals (like in PF), the game stutters. Ideal solution would be to make them spawn at dispersals, wait their turn, taxi to the runway, and take off, but I don't know if it's possible.
Another related idea: I wish the airfields had additional parameter (like 1,2,3,4 - 1 by default) informing the DGen.exe that on this particular airfield planes can take off singly, in pairs, in three-plane flights, and four-plane flights. There is enough room for that on many airfields. Besides, several fighters taking off simultaneously, in line abreast, would look so much more realistically.