not bad ideas, but
Autoback can already be done with idle timers and is used on some skins
HELPmode is mostly up the skin developer, its actually an item on my todo list sadly at the bottom.
Screenlock is currently available already as a plugin of the same name, and there is also another app that does the same.
Demo Mode is cool, this can be done also with AutoHotKey. It comes with a mouse recorder that will record your mouse movements and clicks. Just record yourself doing a demo and when ever you want to show it off, just run the demo. This is actually a cool idea and i think ill do it for lsxvoid.
again, not bad ideas just already available in some way.