The Pit Stop Strategy app works well, highly recommend it over the pit stop feature of the RARE app for example (but both apps can work together). It allows you to create a pit stop window so not all the ai pit on the same lap, which makes it a lot more realistic. Only issue I found is that you need to figure out pit stop duration times, because the AI's pitstops take far longer than mine. That could just be an issue on my end though.
The Rolling Start app is less refined, it is basically a throttle limiter on the first lap, and the AI let big gaps fall in between them. It works for what it does, but obviously its not like the rolling starts on ACC (which I imagine would be incredibly hard to do)
Nuzzo's Blue Flag app is another I'd highly recommend. It makes multi-class racing much better, the AI behave similarly to ACC when you lap them.
Hope this helps!