Marcel
I think the main problem (Martin you can correct if I am wrong) is that the start fuel level as a variable is so embedded in the code that would require a major rewrite. Now, if you guys want to add more functionality (rally mode) then bringing up this variable to the same level as the tyre type might be even more complicated.
I am the first one when it comes to add new functionality, but in the long terms I think you guys should first look at improving some of the features of the current version before adding extra code. A part from the start fuel level to be set according to the weather before the event is started (this is not a new feature/functionality as I was able to do it in the previous version of RCS) I would look at the track condition slider (still a bit confusing as it is right now), more readable dashboard, and the integration of a proper series/championship organizer (the current one is still a but of a mystery to me).
I am going dig out all the comments/suggestions that I have made during the testing and put them in the future development sections. It would be nice if other users would also comments on them so to give you guys a sense of priority to what implement first.