Better Tarmac handling - driving on gravel and tarmac usually requires a different driving style, i;e neater, almost circuit style lines for tarmac is quicker. Yet in this game, you drive it like a gravel surface for quick times.
Co driver - This may not be popular, or possible; but as well as pace notes, I'd like to see old style 'route notes' or 'map info' for the Historic events/ cars. It would add a different element to your driving - you can't just drive flat out when the info isn't 100 per cent reliable.
Old stages - Redo some of the classic stages, especially ones from CMR1; Forest of Bowland in the mist, Dolgellau in the night, etc
Tyre choice - Having to make a tyre choice for 2-3 stages, when there maybe different stage conditions/weather, so you end up making a compromised choice - something first seen on CMR1.
Finally, maybe another tarmac event, say based on Sanremo or Zlin. And if we could have another GB event, maybe either Kielder and/or Yorkshire, including the Woodyard in Dalby....😉