Add a field to mj_set_mocap to change the gain of the motion capture. In other words, we want the ability to have smaller movements of the wrist motion tracker translate into bigger displacements of the hand in the MuJoCo environment. We can code something up in the API to make gain adjustments in every loop of the control cycle, but it would be clunky. It would be nice to have mj_set_mocap be able to handle MoCap gain without taking additional steps within MATLAB during every loop. Alternatively, is there anything we can do in Motive to increase MoCap gain in MuJoCo?