The following is a script to enable drag scroll for a trackball:
-- HANDLE SCROLLING WITH MOUSE BUTTON PRESSED
-- Use button right click
-- Use button 3 for kensington back button
-- Use button 6 for Elecom Deft Pro
local config = {
scrollButtons = { 3, 6 },
rightButtonScrollEnabled = true,
scrollSpeedMultiplier = -4, --