Here's another of those lists of things i'd like to see in FSX. Add to your hearts'content if you like, but try to keep things a bit realistic :)
1- Directional sound
I't'd be a great improvement if you could have different sounds for different angles of a plane. Ever noticed how an airplane (especially jets) sound quite different when, say, approaching you andgoing away from you? First there's a piercing whine from the engines for example, and when it goes away from you, you get to hear a low rumble of jetblast. It'd also be nice to have a delay in sound as the airplane gets farther away from you. This would be vrucial especially for supersonic aircraft, whose sound you only hear after the plane has long since passed.
2- Grass. Nowadays any decent graphix card is capable of furr-modeling, which should be applied to generate grass, hay and other such vegetation when you're close to the ground. We've seen is in many other games before, and i don't see why FSX wouldn't be capable of it. It would make such a huge difference in the appearance of runways, roads.. well just about everything.
3- Movement. What i mean is simple things like trees and other vegetation waving in the wind. Apparently there are already birds in FSX, which is a great step in the right direction. How about some more critters roaming the earth? How cool would it be to chase a herd of giraffes in africa in your little chopper? lol. Or to just have some cows in meadows, whales swimming just below the surface here and there.. stuff like that. Also, i'd really love to see the roads being populated by those things they were made for in the first place.. cars! How about trains? I mean.. the tracks are there, so is anyone actually going to use them now? How cool would it be to actually have people walking around on airports? They're invaluable in getting a sense of scale.. and perhaps you can actually jetblast a few of them into the ocean at st. Maarten?
4- Speaking of jet-blast, we've seen some interesting effects being generated by some add-on planes which had smoke that actually left the impression that the engines are genrating power. I'm talking about the magnificient concorde and vulcan add-ons which have smoke actually being emitted by the engines, instead of popping up some distance behind it and just hanging there statically. What we need is heat-waves (just like in Lock-on) and smoke that spouts from the engine according to the amount of power is generated, and which then goes on to be blown in the wind (Think X-plane here, but make it a bit more grapically interesting).
5- A physics engine which can properly handle VTOL planes. It seems a bit strange to me that in it's legacy of 20 years of flight simulation, MS hasn't been able to properly simulate something to the likes of a harrier or on osprey. Mind you, those are incredibly fun planes to fly, and it would be a very welcome addition to finally see an engine capable of simulating them.
Well, that's my wish-list so far. Bring on the comments and the additions ;)