not sure if there's been a solution or not (it's vewy vewy quiet out there...) but here's my work on this so far - apologies if the code is untidy, but it is a work in progress
Basic functionality only so far, ie you can only edit a single file at a time.
Select a folder using the add files button. Files are filtered by the number of characters in the file name (excluding the xtn) using the spinner at the top. Multiple folders can be added (folders are included in the list)
F2 or double click to edit the selected item (only)
capture single click (x2) editing
Preconfigured rules - I thought about the suggestions for this and it seemed they could be distilled down to a couple of basic rules, ie Trim Left, Trim Right, and replace custom. I envisage Custom as being a comma separated list of characters/strings to remove from a file name (each character/string would be removed sequentially) - this is potentially problematic as the initial actions may create unintentionial matches for subsequent actions
any thoughts/suggestions/feedback (am I on the right track here??)
EDIT - removed old attachment