Well, I might as well post the link here. The app can be downloaded
here. Its a very small app that enables you to set full fan speed when you want to. It needs no driver, just the exe and dll file thats included in the zip file. Of course you try this completely on your own risk, I cant stress that enough.
I had hoped for that it would work straight out of box, on all 5xxx and 8xxx anyway. On the other hand, maybe it only works on 5660's with keyboard bios 1.00.17 like mine. In that case I have to get a copy of your keyboard bioses to check for some values in order to get it to work.