Rewrap
If you answer to a posting and see that the quoting is broken for whatever reason you can try to fix it with Rewrap. This is also a useful feature to reformat your own text after writing, cutting or pasting parts of text.

Rewrap and Join Lines
Like the above normal Rewrap. This one is supposed to join some lines, but I never saw it doing anything else than a simple "Rewrap". Anyone who knows what it's good for?

ROT-13
[snipped from the manual:]"ROT-13 is a very simple scheme to scramble text so it is not immediately readable. People use ROT-13 to scramble messages that may be offensive or messages that contain spoilers (ending of movies, punch lines, etc.). The idea is that the reader must first unscramble the message before reading it, so s/he cannot read it by accident."
You can specify the text to scramble by highlighting it before using the command.

Insert Text File...
If you want to paste text from a file, say, a special sig or an address, here you go.

Replace With Clipboard's Content
Deletes everything in your Edit window and replaces it with the content of your clipboard (as long as it's text).

Paste as Quoted
Pastes the contents of the clipboard with quote characters at the left side.

Paste Indented
Pastes the contents of the clipboard indented by eight spaces.

Paste Indented By...
Pastes the contents of the clipboard indented by the number of spaces you can specify in an upcoming dialog box.