Touchpad buttonless mode - proposal

Hello! The proposal is to implement the possibility use only "Alt+move pointer"-combination (without necessity to press laptop touchpad buttons) to the "Emulate 3 Button Mouse" mode. This kind of navigation is used in FreeCad program, known as "Touchpad" Navigation Style: wiki.freecadweb.org/Mouse_Model (look the "Touchpad Navigation" page section).If somebody tested such workflow in FreeCad daily - could tell it's much more comfortable and simple to hold "Alt" and just move the pointer to rotate the view.