Remove Tags is a great tool for managing tags with multiple files.
I think it could be more useful with "Remove specific tags" option if it shows filenames and tag values on tooltip when the user hovers the mouse over a specific tag. It helps the user (1) to assure what those tags are about that he's about to remove and (2) to locate files that contain that specific tag.
If the list is too long when lots of files are selected, the tooltip can, I guess, have a scroll bar to help browsing.