I'd like to see an always available button to "End Current VNC Session" to drop the VNC session that has the current focus in VNC Manager. This button would grey-out when no session is the current focus, such as List View. Currently, the only way to drop a session now is to mouse way over to the right and hit a relatively tiny "x" to end the session. In full screen mode, that's a long distance.
On the subject of focus, when you end a session, the default behavior of VNC Manager is to switch focus to List View. I'd prefer focus to move to the next active session until there are no more, then return to List View.