Since hbgames.org is down (and a bunch of other places I visit, all in the same day) I tried to google for it and find a version of the page google might've cached but no luck unless you're needing the VX version. Just try googling the terms "RPG Maker XP" and "Super Simple Mouse" and/or "lambchop" and you should be able to find it. Be sure to put "Super Simple Mouse" in quotes, or else you'll be getting alot of random pages with those words.
I have a much better system that I did using AWorks as a base, which everything is all seperate; Mouse module, Mouse Player Movement, Mouse Window Selectables, Mouse Sprite... they're all seperate plug-ins, but as I've been changing over the basic Mouse module in my project it really wouldn't help anybody much yet.
So yeah, good luck on your search!