I would welcome the ability to map every single function of the simulator to keyboard presses (key mapping in other words).  The SDK would also need to contain information sufficient to assist any third party hardware manufacturer - CPFlight, Engravity, Flight Deck Solutions for example - to conceive and develop hardware for your planes, such as an MCP, FMC, throttle quadrant, etc. (or make existing hardware fully functional with your planes).

I, for one, enjoy building my own hardware.  I would welcome the ability to assign push buttons, switches and rotary encoders to various functions of your planes, thus enabling me to slowly build an entire cockpit, using your excellent planes (the 757, future 767, and why not, even the 727).

I encourage others to chime in and provide Captain Sim with your suggestions as well.

Thanks.

Gianluca