Don't know if this would feasible or not, but since I do A LOT of tagging in MC with MCUtils + a lot of expression-based custom fields, and I therefore use the right-click to Library Tools all the time (especially "Find and Replace," "Rename, Move, & Copy Files," and "Move and Copy Fields") it would great to have buttons on the Tool Bar (or somewhere) for these.
Also, along this same line, it would nice (again, if feasible) to not have to continually switch back and forth between different fields in "Move and Copy Fields." For example. I use two combinations all the time, and it gets tiresome to switch back and forth constantly. Same with "Rename, Move, and Copy Files:" since I have different expressions I use for different genres in moving files and setting up their folders, it would be nice to have a set of profiles, or something like it, all button-based, so that I could just fill in the relevant information once and then after just hit the button for both library tools.
These requests might not be high priority for most, or for the developers, but if I'm dreaming about what could be in MC24 . . . .