Linking translations of words used in tags like #dog and #hund.
Also for abbreviations or synonyms. (#USA, #U.S. etc should group together)
I’d want an expanded tag panel were I can see all of my tags and either right click them and edit them one by one, or have an edit button at the top of the list that opens a bigger gui that gives access to all tags and their aliases.
This could also be added with tag folders like described here