Gaming Keyboard macro keys in Blender?

Greetings!

I’m using a Steelseries APEX Raw gaming keyboard, and was wondering if anyone’s had any luck binding macro keys in Blender? I have a set of 5 MX keys on the left side of my keyboard that are just in thumbs reach of my SpacePilot mouse and would like to bind them to certain functions, such as brush scaling while in sculpt mode.

I’ve gone into ‘User Preferences’ and tried to set them like you would normal keys, but they don’t register. I was wondering if anyone had any ideas on how to get around this, maybe script it in or something?

Thanks,
Brad!