For both TCR and GT we need more variety of circuits, they almost always rotate 5 each week. It could be 10 as we have a good amount of circuits at the moment. Also it would be good that the hours and weather vary a lot more because it is always fixed. For example: Barcelona in the middle of the day with rain but at the next rotation it could be clear at night. I think these changes would be very good for the game and would add a lot of variety.
Frist of all it would be nice to have always the full circuit in this 2 Classes, then more dynamic races why not start in the dark and see the sunrise at the end or something like that.