Dont bother with rain ..every other sim crys we want rain ..then when all the time is put in to implement it ..it is hardly used in {MP} racing ..cause really ..who wants to race in the rain
Ok, if no rain, is there option to incorporated more diversification of the weather? For example sunny - mild clouds - overcast? Without any impact on the car physics and track conditions?
If there would be dynamic weather, I think most people would prefer that it actually made both visual and physics changes given that there would be a performance hit.
If you want rain, I suggest you try Sector3's previous game, Race07. That has a wider range of weather conditions.