My GT5 Spec 2.0 Wish List
Tracks:
Real World:
Watkins Glen
Spa-Francorchamps
Magny-Cours
Twin Ring Motegi
Mosport
Perhaps add in some Short Tracks (Less than a mile long such as Eldora, Knoxville or Bristol Motor Speedway)
Original
Red Rock Valley Speedway
Apricot Hill
City
SSR11
Long Beach (They can call it Los Angeles lol)
Cars
Race Cars
More Le Mans Prototypes Please! (ie: Riley & Scott Mk III, Welter Racing LMP, Ferrari 333 SP)
Daytona Prototypes (Europeans may not like them, but they can race hard!)
Sprint Cars to go along with the Dirt tracks as suggested above.
No particular everyday street cars in mind
Exotic Cars
Caparo T1
Gumpert Apollo
Custom Tracks
Heres an idea. Start off with Level ground, and if you want, do a little Landscaping. Raise or lower the landscape to how you please. Also change the banking settings. Some people would like to create circuits like Talladega, Bristol, and Charlotte Motor Speedway (Mostly aimed at NASCAR fans). So a change to the banking settings would be great.
Now as for actual circuit design, perhaps use a custom editor, similar to that of the NoLimits Roller Coaster Simulator. That would make things interesting when designing a circuit. Who knows, someone might be successful at replicating the Corkscrew of Laguna Seca.
Other Features
I'd like to see the AI become more competitive (as others have obviously posted) as well as more situationally aware.
As far as anything else is concerned I have nothing original that what has been posted.