If you like John Bradley's XV image viewer program, you may find the following patch useful. It enables the use of a wheel mouse to scroll selections in the file load/save window, the text viewer, as well as the visual schnauzer. I submitted the patch to John Bradley but I never got a reply, so I decided to make it directly available.
The patch assumes that you have buttons 4 and 5 mapped to the wheel mouse, which is the typical configuration.
Good luck,
Sean