I think that Q2A needs a good working plugin that will allow users to mention other users. I did check the Hashtagger plugin but in my opinion is missing some functions like user autocomplete and also i think that if anyone can implement this js plugin into Q2A Hashtagger plugin it would be awesome. Just take a look here: http://jakiestfu.github.io/Mention.js/
If anyone other is interesting please upvote and maybe Scott or Sama55 could create this plugin.
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April 20, 2021: Q2A 1.8.6 released!