yes, I have tried it, it is brilliant!
but I don't think it does exactly what I want it to do:
1) I want to activate-by-hovering the tabs in Opera, just like the "Tab Mix Plus" extension does in Firefox, and NOT to activate ALL the controls in ALL programs (just specific controls, like opera tabs, in specific programs, like opera)
2) I want to activate-by-hovering the buttons in WinXP taskbar (this shouldn't work with other controls)
3) also, it would be handy to activate the Start menu, by hovering over the Start button
I managed to do them with jgpaiva's scripts both, but the problems described in the above posts still exist