-Make hill climb accessible by all cars, or make it separate DLC so we can ignore it.
-Make Rallycross a purchase-able DLC for the next title...it's completely wasted on a lot of folks.
-Voice increase in volume for the co-driver (still crap)
-Liveries. Please for the love of god take some time or hire/request some people to actually produce quality paintwork for these cars.
-Need more stages per rally (I'm okay with less rallies if you give me more stages per)
-Tire selection...again, for the love of God, tire selection (including choosing for fronts/rears being different compounds etc.)
-Introduce a minor grip change for new stages as cars proceed. This would allow for the real rally feel where front runners are cleaning the surface for those following. This is why in a lot of rallies, if you qualify you'll choose to go further back. It also penalizes drivers who get ahead in the rally, helping those behind gain a minor boost. Introduce something in the coding to allows a 0.5%-1% grip increase per car that launches etc.
-Introduce a rally by stages and the time of those stages, but allow for random weather conditions.
-Allow for weather to change during a rally as cars launch. Allow for rain to cease or to start during the progression of drivers. Ideally allow weather to change mid-stage.
-Better modeling for the cars, this is something I'm confident will arrive in the next game - since this first game is a budget attempt at market research.
-Increase realism and diversity of signage etc. around the stages. It's distracting when a rally is sponsored by two big sponsors...who oddly enough are also the sponsors on your cars. I'm fine with fake sponsors, but along with the livery idea, this needs to be stepped up immensely.
-While it would be annoying, add more camera flashes (particularly at night) when near large spectator areas
-More attention paid to dirt/crud on the windscreen and the windscreen wiper's effectiveness
-Allow for the saving of replays/highlights
-Allow you to watch other people's stages
-Introduce a weather option for dry stages (ie. Greece) where it will occasionally have dust hanging in the air (ie. use the fog filter but with some slight changes), increasing the benefit of going first.
-Tighten up the limits/areas for when the game auto resets your car...or remove the auto-reset completely unless you hit the outer barrier of the graphics/stage. Allow the driver to elect when to hit the "reset" button. Sometimes the game saves you when you don't need it, and likewise won't allow you to reset when you need to. Needs a bit of polish.
-Allow to create "randomized" online rallies by picking an event. Ie. allow me to select "random Greek rally of X number of stages"....and not the "random = every rally/stage shotgunned into the schedule" that we have now.
-Increase the amount of random issues with the player's car...I see a heap of notes in the championships for stuff impacting other cars. It seems we just get radiator and engine lights and then sometimes our car dies. I'd like a mention or mechanics brief on some of the weird stuff I've seen mentioned in the AI. (Broken fuel pump, broken engine mounts etc.)
-Introductory modern FWD class...the F2 Kit is kinda/sorta okay, but I'm surprised we have no entry level WRC3 class or Super 1600's etc.
Disclaimer: Yes a lot of this stuff would make the game more difficult, but I think it's necessary for a proper rally sim. Don't get me wrong, Dirt Rally is very very good, but it could be great (something I expect we'll see with the next title).