Hmmmm...well, this hasn't gotten asked many times...the devs can sure whip up some new technology next update. hint: sarcasm.
Features: it would be a idea if u drive a older car to long that you maybe get some troubles in the engine or electronic defects like the tachometer is not working or one lightbulb doesn't work..or something else broke for just driving around.. Ideas: that u can get Scratches on the Car if u hit something and not just a thing break..or when the car is cold that the car is louder then it is warm...better I6 sounds for the ETK Series they sound like "Honda Civic" lol...real weather and dynamic weather! that the tyres are not squeking when u are in rain and you do a burnout it should sound like in forza horizon 3 with this scratchy tyre spinning when rain! tyre wear would be also nice! and that fluids can run out at a crash! better turbo sounds and blow off's...and dirty simulation if u drive over mud or gravel... PERMANENT QUESTION: Multiplayer is not aible to do! the game is a high performance game and multiplayer i know is a high requested feature but its not aible to do at the moment!
It's possible to give the body panels their own deform groups, allowing said panels to get scratched via texture switching (in much the same way that taillights get smashed in official vehicles). It's by no means dynamic, but it's a start.
I think an interesting Idea would be to add a jake-brake to the T-series engine so we can actually slow down other than brakes and downshifting risking over revving the engine and plus it would sound awesome. Possibly a way to make the engine run away from us too because that would be very entertaining.
I think they should add updated wikis. I know that is not a update to the game but we would have a lot more mods and I could actually understand them I mean come on the ones that are there are like still from 2013-2014 and the games internal files has updated since than and so has blender.
Continuing on this thought, tutorials for 3DSMax/Maya would help a lot since some people know their way around Maya or Max much better than Blender, and it's counterproductive to have to learn a new program to do the same function you already can do in another program.
I would like to suggest a feature such as a "random vehicle generator" where it randomly selects a vehicle configuration (trailers and props don't count) and spawns it up. Just thought it would be a nice fun feature to have in the game, and I don't think it seems too difficult for the devs to implement.