Getting all that done in one click might require some scripting as far as I know.

AutoDisconnect takes care of idle connections. There is some related application that unloads the wifi kernel module to save energy.

Light is handled through Settings, but there might be some application that does this for you in the shape of a widget.

Lower processor speed requires a kernel that has this compiled into it. I think the community kernel that titan works on has this. Be careful though, installing your own kernel might very well end up with you having to flash your device if anything goes wrong. Read up on how this is done and you'll be able to experiment as much as you want.