Yes but none of these settings work like i want. 1 and 2 would be fine if i still could hand someone the link to the workshop and then they could subscribe it. But whenever i give some the link it says workshop not available. Or am i missing something?
SRC uses a feature that is not available by default in SteamCMD and the public interface. As Jimmi is working at S397 he has been experimenting with a new, internal feature and that's how he made this work. We don't know if this will become public. Valve does not seem too interested in making stuff hidden in the workshop, and I can understand their reasoning, since it's supposed to be used for sharing content so there should be no need to hide anything.
https://steamcommunity.com/app/346010/discussions/2/527274088402272832/ According to that, your thumbnail is too large.