Well if you email me with a detailed description, I could do it for you as one that works for vanilla fpsc, but the buttons will not be easily accessible. Just say I want this said. If the user makes this choice, do this. If the user makes this choice, do this. You could use the "Y" and "N" keys, or the "1", "2", "3" ect keys. It can be done.
My email is;
the.pc-guy(at)live(dot)com
I am more than happy to do it for you for free, but what I can do is limited, as I am still learning, but for my current skill level, this would not be hard at all, and I could have it done for you in a day.
http://www.flashstargamecreations.webs.com