- Option "replace [ X ] with [ Y ]" - to replace the term of the original file name (X) with the new term (Y) - this should be included in the main Batch rename dialog.
- Change case - this is also included in the Batch rename in many file managers/image viewers, so it would be useful also in FC
- Option to add time/date to file, or even more info (screenshot #2) would be also very useful.
Few screenshots:


This is one of the most important features for FC.