This is not the same physic, you can adjust the force feedback, strenght, etc... I drive without help, this is a racing simulation software, not a "game" for me.
No need for rain for now, only a track editor. Create your own fork of "Historic Lemans". From my point of view, we need a track editor, you need to create a thread with a proof of your work and only the developer can add the track to the official lfs release.
For now, player pass through insim checkpoint and that read "special.nt" file. You can easily make a loop and, the same checkline can give different notes... I try to release one version (this is my first program) after, i think that can be upgraded for sure!