Petko, I think the new system of editing tags in your latest release is excellent, because it has the effect of making the tags much more visible (and therefore usable) than they were before.
But I've encountered a small problem with the tags. I have one topic devoted entirely to bibliographical references, and as an experiment I did a search for all items that I had located in the Library of Congress but had not yet tagged as such. The search I did was
LC -tag:LC -"not in LC"
When I began adding the missing tags, I noticed that there is some difficulty (a bug?) in making the tags panel coincide with my choice in the "Search Results" panel. If I click on a document in the search panel, the tags panel continues to show the tags from the last document I examined. I am only able to bring the tags panel up to date by clicking on the document in the editing panel. Shouldn't the tags panel automatically refresh itself when I move to a new document?
New tag editing panel
This is fixed in the latest build. Please download again and reinstall.