This is what I've been using for the last few years. Still works with 6.2. We don't have 6.3 here yet so I can't promise that, but since its a VNC registry setting it probably does. Works with K-VNC and WinVNC. Also does not work with Live Connect or RDP.
I have another one that re-enables it. Can't upload multiple attachments apparently though, so you can just save a copy of the Disable script and change the 1 to a 0 in the Set Registry step.