Auto-log Off Disconnected Sessions?

From all my research this doesn't look possible, but I thought I would ask anyway.Environment:- Windows domain environment - 2 2008 R2 AD servers, 1 2003 AD server, 2003 functional level for now- Mostly XP machines, new medical tablets and all-in-one pcs will have windows 7 32-bitIs there a way to auto log off disconnected client user sessions in windows 7? I know there is a way to log off disconnected sessions in terminal services using an idle timer, but from everything I've read you can't do this on a client. I found Grim's screen saver log off solution here and it works if no one uses the fast user switching ability. My problem is that the medical tablets probably will not sit long enough for the auto log off to kick in. A user will come by pick up a machine that the last user didn't log off (and never will, even if I tell them they will lose their jobs if they don't!) and do a switch user function, leaving a disconnected session. This will probably happen multiple times, leaving many disconnected sessions and a slow device. I would disable fast user switching, but our single sign on software must have fast user switching enabled in order to function properly. So much so that it overrides group policy and registry edits.