I picked myself up one of those Kensington Trackball mice as an alternative to my Razer mouse.

Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Blue (K72337EU)

It has a scroll ring that you turn anti/clockwise which is great for moving the chart sideways back and forth (when you turn off the Auto-Scroll button on the chart). So smooth is the action. My Razer mouse scrollwheel is not as smooth.

I have used Kensington trackballs in the past (few decades ago) and they were all a treat to use.
Xard777