What a pitty if this essential function has gone.
So I will stay on MusicBee 2.5.
On MusicBee 2.5.5804 renaming complete folder of an CD works fine.
I use this procedure in V2.5:
Mark one Record, rightcklick EDIT, than RENAME.
I use only the naming template [<Track#> - <Title> - <Artist>]
Click on PROCEED
That all.
Image with details here:
http://i.imgur.com/vgJedfH.png-----------------------------------------------
Update: Thanks Steve you are my hero