The "Fn" key is only used internal to the keyboard for controlling the brightness of the backlighting. The "Fn" key doesn't send any data to the computer. So unfortunately, you can't bind it to another key.
oh well i was going to buy it but...maybe the next keyboard might have the Alt keys in the right places.
also the keyboard looks like it sits too high off the desk. like 4"inchs?
it looks uncomfortable to play on?