FSX and multiple exits

[dc8flightdeck]

I have some korry lights on the 737 overhead wired and programmed in SIOC to illuminate via the FSUIPC 3367 offset. My surprise came when I couldnt find any default door commands in FSUIPC to assign button functions to. All I have found is the main exit command (shift+E) in the default FSX commands.

To control door #2 with a button in FSX,  is my only option to make a custom FSUIPC button offset that writes directly to offset 3367 via SIOC?

Thanks.
Justin