Logged In: YES 
user_id=805804

Enter 'scrooge.mcduck@your.company.com' into the address
field (user.item.html), press the <TAB> key and see what
happens :-)

One could set the focus to the address input field via
Javascript, since this is the best entry point (paste an
email address and get smart defaults entered into some other
fields -- only if empty, of course).

Fields set to 'readonly' shouldn't get changed (untested) as
this is checked by the change_field() function.

The th_label macro and more_javascript slot (submitted
earlier) are needed.

Finally, I added a "reset" button for convenience (which is
localized by the browser)