To be honest, I quite like the racing on the South City Sprint courses. It can get mildly annoying not to have pits, but hey, that's the price you pay for making a mistake. After the first five laps or so, anyone who can't cope will have destroyed both of their cars, and so without pits, they're out of your way.
As for the yellow flag ratio, I find these tracks
help quite a bit - particularly Sprint 2. Doing a lap in less than forty seconds makes it far, far easier to rack up a high number of laps for each yellow flag caused, and the yellow flags are only thrown if you get to a really low speed too. If you have two crashes in a ten-minute, 17-lap race on Sprint 2, which sounds reasonable if you're with sensible enough people and not going mental, that's a yellow flag ratio of just under 12%. Well, that's an improvement for me
This is probably something I shouldn't quote anyone on, but if a second SS1 server - National B and above using FBMs - ever comes into play, then I do think SO Sprints should be taken out of the entry server, but for now SS1 is the only playing field we have with only small, nimble single-seaters to enjoy these tracks.
Sam