As a creator and player here, I second that. You're right about how it works: you can ban people from commenting on a project you own, or posting in its community, depending on what's enabled, but that's all for now. Proper blocking like you describe would be welcome.
Viewing post in Ban/Block Account From Following You
Ah, nice. Thanks for the verification and your perspective! Sorry I couldn't say so sooner. This went from a question to an idea, and I hope soon a new feature!
Unsure if your privileges or knowledge extends to this as a moderator here (maybe you do slick backend web development elsewhere), but do you figure implementing these features would not be difficult? Or is that a question better answered by Leafo or whomever has intimate info on this site's infrastructure? I get that this question could be loaded.