Yes, in addition to receiving the supporters’ medal in their forum profile info, supporting members’ names also now appear in green type on the ‘members online’ tracker in the l/hand navigation panel.
There is no recommended donation amount. You can contribute whatever amount you like to help meet the running costs of the forum, from 0.01 to whatever you wish. Or not at all, of course. There’s no pressure. Some do. Many don’t.
Click on the ‘donations’ tab top right (next to ‘logout’) to see more.