I'm not sure whether this is a bug or not, so I've created a wishlist entry.
I am currently using Auto-Tag By Track - Update Missing Lyrics quite a lot. I'd like to add a toolbar button to get at this command quickly (or perhaps add a hot-key to trigger it). I can find many of the Tools: Auto-tag by track sub commands under Hot-keys in Edit Preferences and also in the command list of the Set Toolbar buttons dialog (which I think is the same as the hot-key list), but I haven't found Tools: Auto-tag by track - Update Missing Lyrics..
Would it be possible to make this command available (or am I just looking in the wrong place .....)
Many thanks - as always - for MusicBee; the more I use it, the more I like it!