You can use r2la Championship Manager to track points. But r2la can not help with making AI drivers consistent from race to race. That is rFactors task, which it can not do easily for all mods. I know and use one method that works for mods where cars have assigned drivers in mod files (I don't know which files, I don't mod): you must count number of cars in the mod and set AI number to that value minus 1 (for you car). For example, FE 2020 has 24 cars in the list in menu, set AI to 23 for every race. For Enduracers Endurance mod it also works if you count amount of AI cars in opponents selector when you select some season filter. I don't have IMSA mod, so don't know how it is structured. Another method is loading a track with zero AI. Then using "Add AI" button and add AI cars one by one. As far as I remember you have to make sure that you add unique AI cars, no car duplicates. I run GT3 season with AI this way, added as many AI cars of one make as there are skins. Did not add car with my selected skin. This is not very easy, because if you have to leave the track to make some changes in menu, you will have to add AI one by one again. Third method involves editing and creating mod files, I don't know about that.