Reprogramming Sidewinder Mouse

Hi folks

After some recent frustrations with my old wireless mouse I've invested in a new gaming mouse, opting for the Microsoft Sidewinder as seen here:
http://www.itreviews.co.uk/hardware/h1429.htm

My issue at the moment is that the three DPI adjustment buttons (just below the scroll whell) are pretty useless to me for WoW, they are designed primarily for FPS games I guess. I'd like therefore to reprogram these buttons to keystrokes attached to in game actions such as trinketing, mounting or whatever. The standard Microsoft Intellipoint software doesnt offer this functionality, so I was wondering if there was any other way of doing this?

Any advice appreciated.

Thanks

Hmm looks like Autohotkey might have some of this functionality from the web page, but is there a way I can get it to recognise these DPI adjustment buttons as vaild inputs?

http://www.autohotkey.com/docs/Hotkeys.htm