I look for a plugin witch can show editable table with users (as rows) and groups (as column)
How to restrict view, edit access to just the author and moderators?
Using the privileges , can we restrict the posts done by the user are seen just for him and the moderators? More like a 1-0-1 communication between the author and moderators.
To just the author and mods, unfortunately we cannot support this yet, as we don't have a "post author" pseudo-group. That is a good idea, though.
We did accomplish this via nodebb-plugin-support-forum, you could try this and see if it still works?