Does anyone know of any alternate software for Microsoft keyboards that would allow a user to use keys like back/forward, webhome, search and mail for recording keystroke macros? Using the IntelliType software that comes with the keyboard, currently you can only choose from a list of commands (new, close, etc.), open a program/file/webpage, or disable it entirely.

The idea is to use these pretty much useless keys to program screen switches in Synergy. Unfortunately, "disabling" the button will make the keystroke not show up at all if you try to use it for a hotkey in Synergy.