Hmm. Tough feature set to implement. Points 1, 4, 5, & 6 are out of scope for mk to code, and I think that points 2 & 3 alone don't really solve certain real, and common problems.

Take trolls or antagonists for example. If someone was antagonizing you, and you blocked them from seeing your comments, they could still see replies to your blocked comments, or references to your conversation in the thread. They could easily just reply to another poster and engage you directly somewhere else in the thread. You've completely opened yourself up to being antagonized.

You'd need to be able to block comments from others, not your comments to the site for them to read. If you're talking about blocking a user's comments, as well as blocking yours from them and maybe blocking the responses to your comments as well, then that's starting to get into abuse ban territory where members can indiscriminately block users to public content. For example, a popular user who has a lot of followers posts a link to a major trending story. If that becomes the de-facto place for discussion on the topic on Hubski, then having the powers you are suggesting, you could simply block users of your choice from the biggest major discussions on Hubksi for major news events. I don't think it's going even one step out on a limb to say that that is ridiculous and flies directly in the face of Huski's mission statement.

The goal should be to give users the ability to moderate without destroying the user experience that Hubski is attempting to nurture. Your posts being invisible at your whim is a non-starter, but I could see your comments being invisible more plausibly. I personally think that flies in the face of what Hubksi should be and am against it, but I could at least imagine a scenario where some fraction of users might think that it is useful or adds to the goals of the site. But before anything I think you need the ability to hid comments from other users, -maybe you were assuming that in your list above, but I wasn't sure.