I'd find useful if the command Insert while editing a name worked not only when the cursor is over a character but also when it's over a blank.
Sometimes I find I want to just insert a string in between an existing name, and I have to use Insert after typing each character. It would be faster and more practical to create as much room is needed all in a row, and then to type the new characters.
Basically, Insert would work the way Delete currently works.