According to the answer to the question, TM representatives read this blog and can accept some improvements to the habr.
Therefore, I propose several points for modification:
Contact the author from the sandbox. They posted a topic in the sandbox that I liked, but I would like to talk with the author to find out why he was invited. Maybe it's a virtual, or an invite to sell. Well and, accordingly, the possibility of anregating the invited user within a month from the moment of its registration.
Modification panel html-tags. Why not add all the tags that are, when writing a comment? Well, or at least add very useful ones - quoting and the source tag.
Integration with habrastorage. Since habrastorage welcomes me as a habr user, why not keep a list of my files?
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In general, here are the suggestions. I do not think that they are difficult to implement.