Another good news and achievement!
On my Galaxy Note 4 (treltexx) port, I got the S-Pen working as a mouse! (The S-pen is a stylus with enhanced functionalities developed by Samsung for specifically this device family.)
Both the left- and right-clicks are working fine:
- left-click = I touch the screen with the S-Pen
- right-click = there is a button at the side of the S-Pen which is repurposed for right-clicks (as the device detects the distance between the screen and the S-pen, for right-click I don't even need to touch the screen with the S-Pen. )