I don't know what you have in mind but here is one suggestion:
My main concern to simulate championships is that many times some pack tracks do not fit the real time on the mods.
Usually I need to make some changes in the MD to fit real times and to be competitive with AI cars. Maybe I'm a bad driver
but today I have no idea about that because it's difficult to compare with other drivers that could use different configurations.
My suggestion is define the semi-pro category with MD default settings reference to a competitive championship. If some user wants to increase the difficulty he can change category and car settings in the game.
This would make it easier to GP4 fans install the mod and the track and start a championship on the semi-pro without change any car settings or even MD/Physics (time consuming).
I know that part of the fun is to change the car settings but for rookies or people with not much free time it's a problem.
I think it would be nice to share times in the forum based on this standard defined.
We can have some experience or general pilots to test the mod and publish here the results to compare and define what we need change to track MD or car physics.
Concerning sounds if you want my help to improve it let me know, I will be glad to help.
Graphics I think it's almost perfect.
Best
Jose