Hey,
I've pledged for this sucker to work with my devices, but I have a theory this would be lots of use to people playing games on their Retrode..
http://www.kickstarter.com/projects/1703567677/icontrolpad-2-the-open-source-controller
Controllers are strange beasts: the proof is in how they feel.
So many I have bought in the past feel bad. They makes the efforts of Nintendo, SEGA, etc, seem inconsequential when it does in fact require great skill, research, development and planning. I've been disappointed with far too many third-party controllers, and that was one of the reasons I bought a Retrode - to use the original, best controllers.
I guess what I am saying is: I'd have to try one of these before I even thought about buying.