I have a Raspberry Pi B running Raspbian. I'm using it to create this for my little brother. I'm using Adafruit's Retrogame code (found here) to receive GPIO inputs and convert them into keyboard inputs. I've been able to configure it to work with a keyboard plugged in, but as soon as a keyboard is unplugged, the pi no longer receives input.
Is there a way to trick the pi into thinking that a keyboard is connected all the time? Is there a kernel module I can install or a package library that will do it all for me?