I am trying to contribute to making the PTR better by adding siblings/parent and removing garbage, but this doesn't help. In manage tags window, I sibling a tag like this:

tag1 (displays as tag2)

How do I now add parents to tag2? I can't. Also the sibling change does not appear until I commit the pending tags, which means I'll have to close the manage tags window and lose my place in the tag list (I often have thousands of files open at once so the list will be long). Annoying.