You know this is a very interesting thought. I am not sure if CATIA would allow you to generate a dynamic update to the models (mechanism driver positions, components positions, etc) from input from some type of peripheral device. A very interesting line of thought though.

I am pretty sure you could ultimatly interface with the input device through VBA provided the programming know-how is there. Definitly a bit out of my realm as far as CATIA Programming is concerned though. This may end up passing into the realm of the CAA C++ Development Tools depending on the complexity.