skyhawka4m,
Two that I can think of.
1) FSX GA Traffic by Marcus Brunner - [FONT=verdana, sans-serif](fsx_ga-traffic_releasecandidate2.zip on Avsim).
2) RPP FPGen by [/FONT][SIZE=-1]Rysiek Winawer.
#1 I use, #2 I have not tried yet. # 1 is a little tedious, as you have to specify which aircraft you want included in the plans. Unfortunately, by default it see's ALL of your aircraft, so you do have some excluding of aircraft to do, unless you want high-poly flyable addons out there killing your frames. It will allow you to determine which airports to use, and "activity level" (so you don't over-populate with Cessna's). I also allows you to keep the Cessna 172's out of large commercial airports like, O'Hare, Heathrow, Milan, etc.
#2 promises more "control" - you determine the airports, it builds the traffic. It is supposed to be applicable to military too. I don't know for sure, I have not tried it.
[/SIZE]LCSims,
I agree that the UGA packages are great, especially for the business jets. I too have Ultimate Traffic 2. You can tell it which airrcraft to use from your collection for GA. So you can tell it which AI aircraft to use. The problem, in its latest iteration, is that it generate GA traffic EVERYWHERE. Nothing worse that having to do a "go-around", after a long flight from Europe, or Asia, due to a J-3 Cub on final to Rwy 14R at KORD at 40 knots!!! I've turned the daily schedules off for the smaller GA in UT2 (kept the Bizz Jets though). I've used #1 above for the smaller GA.
Anyhow hope this helps.
Bill