I find I'm doing the Unix command completion/IRC name completion thing where I type a few letters of the username and hit tab when I'm entering comments.
Please consider adding a bit of JavaScript code that:
- When focus is on a comment input box
- When tab is pressed
- If the preceeding 'word' is 'like' a username in the comment list or post then complete the name (else, tab to the next tab-able element as per normal)