Thanks for pointing this out. My thought is that it would pick up at whatever field you mouse clicked on most recently (this is the current function when selecting a single file). TAB currently allows you to switch between fields easily as well.
Example:
Click one file on the TITLE column, shift+click a few rows down to select multiple files, press F2, and edit the TITLE for all selected files. All done inline with minimal keystrokes.
Has anyone here used J River Media Center? It works like this within that app. (Yes, I know I can just use that app instead. I have been using J River for the past 8 years and would like to use Music Bee instead with similar functionality).