You laugh, but using the touchscreen for this works well, except for those with smaller hands. A small touch box might work well, sort of like a mini touchpad ala a laptop's touchpad. If you moved your finger to the side it could scroll more quickly than a joystick and as you brought it in to the middle it could slide the focal points to a smaller area. You could also do some neat ui tricks on the display by drawing a box around a zone of points, and moving your fingers to the edge of the touchpad moves that outer box to quickly zoom to another area of the display then moving more towards the middle selects the points in that zone.I believe the "new type of joystick" is going to be an eight-directional touchpad controller building on the tremendous success of the touch bar on the R. Remember, you heard it from me first!
You could do this with an analog style joystick too - light touch moves just one or two points at a time, hard push to the side moves 10-15 points at a time. If you've ever used a PS4 or Xbox, this would be analogous to the stick controller.