Well.. If you have a cyber cafe, you probably should be looking for some more developed solutions, more adequate to your situation.
Anyways, here are some tips:
If you're running windows XP pro, run "gpedit.msc", and open user configuration -> administrative templates. Then browse those options, i bet you'll find a bunch of interesting stuff for your situation there.
Also check tweakui
, it allows you to disable the display settings (and thus the screensaver settings) IIRC.
As for the log... Currently with the code as it is, it's impossible to add. I'll try to add it when i have time.