Feature request: Add "Trim" to Insert/Delete tab

[Duke]

One simple feature, as seen in Bulk Rename Utility for win32, is to trim letters with reference to the end of the filename instead of the beginning. Simply put, add a radial under "Delete from/to" that says something along the lines of "Trim beginning/end" and 2 more number boxes that start at 0. Increasing them removes that many letters from the beginning or end of the filename.