First of all, we could do with decently dark nights, or perhaps I should say at least SOME decently dark nights. The ground is nearly always too well lit, IMO, and thr ground is actually hardestto see for a short while in twilight. Once the sun is properly set, I can takeoff, fly, bomb and land as wellas in full daylight, as things currently are.
Perhaps if the moon were made to be out ofphase with the sun (as in real life) so that not all nights are moonlit. An even nicer touch would be if thephases of the moon changed, and the level of moonlight accordingly.
As for flarepaths for airfields, I've suggested something of the sort before, but more limited than Replicant has suggested. What I suggested before was that if it were possibly to destroy certain field objects on demand, one could position otherwise non-functional fuel tanks just to the right of each end of a runway. To land, you'd then aim just left of the near flare and just right of the far one. It'd be far better if a dedicated object that could be switched on/off were used, though, and with limitations on how frequentlyit could be used and for how long.
Such flares would not need to be actual sourcesof in-game light - solong s they are visible from tehair, that suffices.
Another point is that we could do with nightime cockpit lighting. I find that I don't manage too badly as is, but then I tend to fly bombers. I note with interest that the indicator lights for gears, flaps,autopilot etc DO act as a kind of virtual light source, making bitsofpanel near them easier to read. All we need is proper green night-lightsfor the panels, and we';re away there.
finally - parachute flares for bombers. Again, they do not need to be sources of light, so long as they are visible, although if they were in-game sources of light without hitting performance too hard, it'd be aplus. but at the very least, they would allow night-bombing of a more realistic sort where some crews act as Pathfinders, marking targets with flares, so that other crews can bomb targets that they otherwise cant see.
Esme