I find myself a lot of times where I put up a session and someone at the remote location jumps from computer to computer to connect me.
Instead of ending each session and creating a new one I typically just right click the tray icon on the guest side and exit it. This way my client can just connect to the same session over and over.
It would be really nice to have a button on the host session window that forces the guest to disconnect, but leaves the session alive and the host connected.