Original version created by Emre Yolcu.
Forked, modified and modernised to a universal binary, icon and XCode project file.
This small utility provides a toggleable drag and scroll mechanism for macOS. It is especially useful with a trackball where you can press mouse button 5 and roll the ball to scroll through a large website or a document.
You may download the binary here. It runs in the background and does not interfere until mouse button 4 is pressed.
If you want this to run automatically at boot you may go to System Preferences > Users & Groups > Login Items
and add PixelScroll to the list. If you want
to undo the effect you may launch Activity Monitor, search for PixelScroll
and force it to quit.