Hi, maybe this help someone, but I have developed my "custom workflow" over the years, to play rFactor1 offline. I take my time customizing each mod to fit the championship I want to play, tweking some variables for the mod and for the tracks. I also rename the drivers to match the drivers that I want to play in my championship, deleting the cars that I don't want, then I train the AI for each track that I want to race, and tweak the AI to be competitive enough to make it fun.
Then I run a race weekend with classification and race, and load the result file with the tool "rF2 Log Analyzer" with it, you can create your own "custom championships" loading the results file for each race, with differents options and point systems of your choice.
Is kind of tedious, but it work for me.