Razer Blackwidow - Add Fn alternate binds

I just received a Razer Blackwidow Ultimate for Christmas and I was wondering if there was a way to rebind the function of keys when Fn is held. Razer Synapse allows the remapping (to some extent) of the "main" functionality of a key, but gives no control over what happens when Fn is held with a key, for instance if I wanted to give Fn+F4 an effect. Normally one would use AutoHotKey for this, but Fn is not registered through software.

 

Could work, bought my dad a BW Centaur keyboard and a function is to use the FN+W keys to "remap" the WASD keys with the arrow up, down, left, and right keys(my guess is that it is for left handed people who have used a mouse with their left hand and find it difficult to play FPS or other games)