I've not read through this whole thing yet, so I may be re-covering things here.
I love DiRT Rally 2.0, it is an immense game. I'm sure licencing is why there aren't any Toyotas, but that is another story.
Here's what I would like.
Ability to edit a pacenote (even just raise or lower the number and add a tightens or opens or drop outside/rocks inside). More pacenote detail (Phil Mills had incredibly detailed notes for Solberg, and I would happily pay for a DLC containing this.
Robert Reid co-driver option, again I would happily pay DLC.