I don't know how many users use logitech keyboards or keyboards with macro keys built-in, but I think that adding the option to assign a function to a macro key within display fusion would be beneficial.

In logitechs case they have released their G-Key Macro SDK that would make this process easy to implement should you choose.
The SDK is located here http://gaming.logitech.com/en-us/developers

Any progress on this goal. I have switched to using a mechanical switch, gaming keyboard with macros for productivity purposes not for gaming. I would really like to be able to directly control Displayfusion from the G Keys on my logitech.