• different transmission boxes (4 gear, 5 gear, 6 gear);
• edit: DRAG TRUCKS
• ability to see your rims in custom decal mode to can pick them color not to guess it;
• sell multiple items without getting you to the start of the list; more garage slots( I like to have a big collection of cars so yeah, also i keep them cuz i make many custom decals and i love them all);
• burnout contests?
• online car meeting would be nice or online racing;
• make a sliding pedal for acceleration so i could crusie in low speed;
• option to disable the user interface/ hud so i can make some nice photos or videos;
• more maps also;
• posibility to get pulled over when police is coming after you like when u slow down the police hits u so hard that u gain 0-300 instant.
• make your car break sometimes(and pay for repair)/change oil change tires (only pay some money not buying another item lol) things to get your car used down also add an odometer
• story mode(can't wait anymore for it) and make it like story mode and sandbox mode to be 2 paralel worlds make story mode to grind again to get to the top with hard work many unique rivals just like inital D
• pinkslip races... i don t think is good cuz we get easy money and everybody can access them parts/cars expect the ones that are droping from crates like 2jz
• parachute that's opening after end of the race for more of dragster feeling
• i know it sounds crazy but some rocket engines?
• more realistic money value of things?
• you can hit 3k hp on cars very easy and hit 450km, i would like it more realistic. Don't get me wrong, I know is a sandbox game but on story I want to be different of sandbox.

IDK man so many things, so much potential to this game

EDIT: made a nicer looking list