They could split the dailies as follows: S, A+ and A (above 40k DR) ranked drivers only get matched with each other. And, A (below 40k DR) through to E can all race each other. Or have an option before a race, points race and non points race where the driver selects which kind of race they would like to enter. Anyone contesting a non point race neither gains or loses DR. This way the ones who race just for fun and the ones who race competitively can be separated.