Speaking of multiple installations - what I missed in rFactor was ability to have shared folder for tracks.
I think it would be nice if each player could simply add a list of search pathes for vehicles and tracks. Why list and not juz one extra search path? I could have separate folders with oval circuits, F1 circuits, rally stages, historical circuits, work-in-progress circuits and so on. Circuits could even have conflicting files, as long as they would be kept in separate folders.
I would then have a player with oval, road and street circuits, another one with just rally circuits, and one more with just work in progress circuits.
I can do that now, by having separate rFlite for each player, but only if each circit is used by just one player. If some circuit is used by more player profiles, I have to make another copy of it on disk (in another RF installation).
Of course this is example based on rFactor(2005). Perhaps it's totally outdated with the new modding system in rF2