Pro-Users will be benefitted with special support forums and faster bug resolution times.
Just submit a bug report on the bug tracker and make your donation. Please specify your bug number along with the donation so I can establish a relationship between both.
If you have a feature request procedure is the same. Just submit a feature request in the bug tracker (bug with severity "feature") along with your donation.
All donors will be considered Pro-Users and will receive access to the Pro-Users forums.