BRU is a wonderful, inspired program, that outshines the thirty or forth other programs I checked out!
One of the many features I like is in Section 11, allowing the user to filter the files/folders, and set Minimum Name and Path Lengths.
Suggestion 1: Allow the user to set the maximum number of recursive levels. Example, if MaxLevel = 3, the filter would show and limit the renaming to L1/L2/L3 but not show or change anything below that third level, e.g., L1/L2/L3/L4.
Suggestion 2: Allow for both minimum and maximum file names and path lengths.