Hello. Thank you for this interesting suggestion.
You can edit the php file, and in line 57, where it says:
$CORRECT_EMAIL = '';
make it:
$user =& JFactory::getUser();
$CORRECT_EMAIL = $user->email;
This way, if the user hasn't typed anything, the initial value for the inputbox, would be his Email.
That's a nice feature.
Possibly I will include it, too.
Thank you again!