Explain the problem as you see it
When tagging or adding a reference to a node, I tend to think in an directed graph manner that reflects the context of the reference (what links to it / what was I doing when I created this node / what does this tag extend).
For example, let's say that I'm tagging a quote or a thought and I want to choose the right #topic to tag it with. At this point in time, the most straightforward thing for me to do is start writing a parent tag (say, "#topic") and I would like to have Tana show me all the tags the extend (inherit) #topic (more generally, all of the backlinks, in this case, the tags first, then the other links to the tag, because I'm tagging).
Similar examples for regular @references are easy to think about, e.g. I'm looking for a note I wrote while summarizing some paper, so I'll start with the @paper_name and traverse the graph via backlinks (would be nice to also suggest notes directly under the paper note in the outline structure in the autocomplete menu, maybe after "tabbing/traversing into it").
Partial workaround: The search pane is quite powerful, and can solve some cases without explicitly traversing the graph (no way to limit the results to backlinks of a specific node rather than a semantic search).
Would be great if it could be integrated with the autocomplete menu (I'm not finding a natural way to insert a search result as a link/tag to my current cursor location after ctrl+s).
Why is this a problem for you?
Creates friction while linking and tagging that could be easily solved.
Suggest a solution
Example using tags:
When tagging, add suggestions of backlinks (including "extending tags") based on a current "traversing location in the Tana node graph" the first node would be selected using auto complete of the name being typed and using Tab to select a node.
i.e. after selecting #topic with tab, suggest the tags that extend/inherit #topic, then when selecting a sub-tag (tab or mouse click) update the suggestions based on the sub-tag location... allowing the user to traverse the tags graph in an easy way.
Another way to put it, is to allow traversing the Tana graph while linking via backlinks (tag being a special case of a backlink).