Best device for scrolling images?

[Entropia]

In my job I have to view thousands of images everyday and I use ACDSee in fullscreen mode and the mouse scroll wheel to browse them. One of the mouse buttons uses a script to select the current image. Sometimes, when my finger gets too tired or hurts, I switch to my left hand and use pgup and pgdown to browse the galleries.

Do you know of any specific device that allows a more comfortable and ergonomic scrolling? I've thought of a dedicated and larger scroll wheel, but I don't know if such thing exists.

Recently I've discovered a kind of jog wheel called Shuttle Xpress, which is used for audio and video edition. I don't know if this would suit my needs. What do you think?

[davkol]

large trackball + autoscroll (can be emulated in X.Org, XMBC,…)

[3K]

I simply scroll with PageDown. I guess the key can be remapped, and used with every finger, so the stress is divided between all fingers.

[tp4tissue]

I think i saw a japanese laptop that had something like this in that godzilla movie i just watched..

[Encabulator]

It would help if you could be slightly more specific on what the job was. Is it possible that you could run an AHK script that will scroll through images at various speeds based on which button is pressed and if you see something you need you can press a key to stop it? Otherwise there are things like free scrolling mice
demonstration


Or, if you need to scroll through those images REALLY fast.