[RyanCahoon]

The RoboRIO is reported to run Linux on an Arm processor, so any USB device that has drivers for that platform should be usable. There seems a good chance that this will include mice.

I've heard of mice being used on robots in the past in the same way that follower wheels are currently used on FRC robots. The standard problem with this is many mice can't read linear speeds fast enough to keep up with many FRC robots, though some of the newer gaming mice look like they may be up to the task. For autonomous, where drive speeds are typically kept lower to make the robots more controllable, this would be a much more viable approach.

The data output would presumably be the same as for a standard mouse: X-Y movement coordinates, either as deltas or accumulated measurements.