I am sure 99% of the world who uses keyboards a lot is accustomed to typing ALT-D to jump to the address bar in browsers and in Windows Explorer. Whenever I'm in Bulk Rename, I expect ALT-D to work but it never does. Implement that keystroke.
Also, and whether this is a bug or not is debatable, the UNDO function only works when you click inside the file list when I hit CONTROL-Z. Thirdly, Undo function is expected at top of menu by most users, so it's discordant to have it at the bottom of the Actions menu.