I'm trying to get the special keys on my Natural Ergonomic Keyboard 4000 working under OS X El Capitan. Officially, Microsoft only offers limited support for this keyboard on Mac.
The multimedia keys (mute/volume/play) work, but the home/search/mail/calculator keys don't. The official IntelliType Pro software also lacks a way to configure the programmable hotkeys.
Are there any unofficial tools to get them working?