"optional windsheild wipers" - this is done in Colin Mcrae DiRT so it can't be too hard for Atari to put it in.
"2. Open/Close Convertable Roof" - this would be awesome but the only problem is that would you be able to operate it whilst driving along at over 100MPH as that would just be asking for trouble
"4.Active Weather (Rain/Thunderstorms)" - they should sooo do this and also add real time weather like what is in flight simulator, so if it is raining on the island it rains in the game etc.
" 11.Radio has commentary like commercials or Speakers" - they could also stream a radio station from where the game is set, the only problem would be the language barrier.
"12.Good lighting effects/animations." - this is important because if there is a day and night cycle then you need lights and if you are sat in the cabin of your car then you should get the dash board controls light up, and having 2 stages of lights should be included as it would be awesome.