Well, the only thing I can think of is this (and I don't think you will like it !)
As a preamble there must be lots of people like me who name files Doe_J_001 , Doe_J_002, Doe_J_003 etc at the time of the shoot, then weed out the bad ones & want to batch rename but keeping the original stem, changing only the sequence number
So my dream answer would be a whole new command (preferably with a keyboard short-cut, or right click) whereby I could select a series of images on the contact sheet page & then re-sequence them without having any dialog box at all. You could call the Command Re-sequence
The user would be required in Preferences to stipulate how many suffix places should be removed eg {filenamebase:0,-3} or {filenamebase:0,-4}. Actually they probably needn't see that computer language which not everyone will get their brain around; rather a description in basic English. Similarly they would be required to stipulate how long the new suffix (sequence) should be eg 001 or 0001 or 00001 etc
Anyone else fancy this ?
Interested to know what you think Kirk
Thanks again
Stephen