1. more people per server
2. being able to modify inside and outside of your car
3. a better way to sell cars and bikes over trade
4. more bikes
5. more biker gear (better leathers)
6. tune cars to what you want
7. be able to drive boats(that would be cool)
8. night time
9. rain and storms
10. damage would be great
11. be able to set up proper clubs(your own logo for club and stuff like that)
12. drap strips out on their own
13. more tracks
14. cars need petrol to keep going
15. give money direct to people
16. have your own music playing in your car
17. more places to go to eg: hotels, pubs, gyms, supermarkets etc..
18. be able to work to get some money up(optional) this could be a good feature
19. be able to tkae proper photos and upload them better
20. like what glanz said, take a drivers test to get your licence or be fined and banned off road for period of time
21. buy land to set up own car or bike business, to sell cars
22. more cars, subaru, low riders and more muscle cars
23. tracks just for drifting
24. you have to get every car via download on marketplace so that not everyone has the same car
25. have more tunnels to get to places fast
26. road like autoban, fast cars only, have to be a certain speed or else not alowed in
27. offroad vehicles
Cant think of anyting else at the moment but this is most of the stuff that would be cool if it was to go into TDU
Maybe some of the ideas are a bit mad but this is what i would like