I frequently found when manually calibrating targeting, especially the eyes, being able to change only one slider at a time was somewhat of an issue. I would like to have more than one slider open at a time, or even have left/right sliders combined into one submenu. Calibrating eye direction is especially annoying with one slider open at a time. I would also like to be able to pause tracking with a hotkey. I dont like having to change menus and click the pause button everytime im trying to calibrate an extreme facial feature, like looking away from the screen.