I often use thumbs to control cursor via touchpad while doing 10-finger touch typing. On Windows and macOS I can configure one finger scroll: if some hotkey is pressed I move thumb over the touchpad to scroll up, down, left and right. This is handy since I don't need to move my entire hand in order for 2-finger scroll.
Is it possible to somehow configure the same behaviour with the latest Ubuntu desktop? I know about the "1-finger edge scrolling" but I want 1-finger scroll for the entire touchpad while hotkey is pressed, since touchpad edges are hard to reach without removing my hand(s) from the 10-finger touch typing position.