A few more...
- L/R Scrolling when browsing folders and directories.
- Able to save as one of the Line Endings (Linux/Unix 0A-h, Macintosh 0D-h and Windows 0D0A-h).
If you making a Mode Button, at least consider some of these too:
- Select All function.
- Cut, Copy & Paste functions.
- Undo function.
- Search function.