Very glad I found this. My boss has disliked the requirement since launch.
@ smokinkat:
The change quoted above was only to eliminate the requirement for Assignment of tickets.
To disable the requirement for Transfers as well:
//Transfer message - required.
//if(!$_POST)
//$errors = 'Transfer comments required';
//elseif(strlen($_POST)<5)
//$errors = 'Transfer comments too short!';
For me, it was lines 91 - 95