Next time they're stuck there, do THIS:
Go to your Jellybean bank, and "use" it
Once you're at the jellybean transfer screen (the one with the two big arrows), just walk away from the PC. You will never "Get sleepy" and hence never log out.
This one is really nasty for window mode because you can minimize the screen and "forget" about them. ALT+ENTER should work to minimize the screen if you're not in window mode
The Jellybean Bank trick works well to keep your toon "awake" if you need a nice bio-break or have to make dinner, etc. that would normally trigger the auto-logoff.
Anyhow, I'm not condoning this dirty trick... just posting it out there. If the Devs read this at all, they might as well fix everything, right?