Hi, thanks for the feedback and I am glad to hear you are enjoying the app.
Take a look at civitai.com. The settings shown in the image examples for various models should transfer over to AI Runner. The one missing setting at this time is Clip Skip (but that will be added in the upcoming 2.3.0 update).
I do suggest you play around with the settings, and you can also join Discord (get the link from the help menu) and ask what other users are doing.
A user manual is a great idea and has been on my list of todos for some time, along with tutorial videos.
Currently I am working on the v2.3.0 update (as mentioned earlier) and it is massive. Most of what you mention is covered here in the changelog: https://github.com/Capsize-Games/airunner/pull/290
This update has been in the works for a couple of months and should be ready by the end of this month.