You can right click via tap hold or the back button of your device. The events for scaling/zooming are velocity based, maybe this is causing issues with lower resolution devices, I will look into this. I've tried tap & hold, but when I tap, it's always triggers left click, and only then -- righ...

Tried to play Space Quest 5 on NL735, it was not very comfortable =( 1) Need right mouse click. 2) Scale up & scale down doesn't work for me. Maybe there can be several touch modes: 1) Absolute (as it is now). 2) Relative (touchscreen becames a sort of touchpad) like in TouchMousePointer utility.