You can use the Trackball API to filter the trackball movement data that the BlackBerry® device hardware sends to the software layer. The Trackball API can filter out movement "noise" or unwanted movements.
You can also use the Trackball API to change settings such as trackball movement acceleration. Increasing the trackball movement acceleration setting can result in the software layer identifying trackball movements as moving at a faster rate than the rate detected by the BlackBerry device hardware, as long as the user continually rolls the trackball. The trackball sensitivity temporarily increases as the user rolls the trackball without pausing.