Artwork edit capabilities were only recently added, and maybe in the future Track Tool will have it too (if users request it). Apart from that, there are no differences between Music Library's Track Properties window and Track Tool: both allow moving to previous/next track quickly and make all the edits (actually Track Tool allows to edit more fields, e.g. Voice Insert). Those two features do mostly the same thing, so I, honestly, don't see any reason in adding Track Properties to other parts of RadioBOSS - this window is Music Library's features, and its main purpose there is to bulk edit tags.
For this, it will need to search all the libraries and open the one where this track exists. I'm not sure about use case for it. You can directly edit anything from playlist, search or any other area, by calling Track Tool.