The command line can be edited in the same way as a string in a dialog box.
Characters typed in the middle of a command line will either be inserted or overstrike existing characters, depending upon the Dialog insert mode. The Dialog insert mode is independent of the Visual insert mode.
[INSERT TOGGLE] Toggle the Dialog Insert Mode between Insert and Overstrike modes
After editing the command line press <Enter> — it is NOT necessary to first move the cursor to the end of the line. To enter control characters on the command line, first press [ENTER CTRL] (default: <Ctrl-Q>) and then the control character, e.g. <Ctrl-X> or <Enter>[ENTER CTRL] causes the following character to be taken literally, and not to be interpreted as a line editing character or any other special character.