I’ve posted a bit about this on BYOAC, but I just realized some people over here might be interested. The AKI 3.0 USB Interface could be useful for people building custom controls. It supports analog, digital, and 49-way joysticks, as well as joystick to keyboard and joystick to mouse conversion. I’m not sure how it would work with consoles that support USB (I haven’t tested it yet), but it’s great for PCs.
You can check it out here: http://bspeclabs.com/Electronics/8-AKI30
Also - the firmware is user upgradeable, so if anyone has suggestions for new features, they may be added in the future.