Reading the source code of the QML Dial implementation, the drag area for linear movement is hardcoded to twice the width/height of the Dial control. This is not enough when you want to save space on screen but allow for precise control of the dial value. For example the effective size of the dial might be something like 40x40 pixels but for fine control, it would good to be able to have linear movement over 400 pixels.

Please consider making this drag area value configurable from QML.