Hi Tiziano,

There's no way (at present) to disable the mouse wheel. But I
think I may have a fix for this problem. At the very least,
I've added a way to shut off the mouse wheel.

A couple of questions...

(1) Is this affecting other programs? If so, it would make
sense to look for a general solution that "de-sensitizes" the mouse.
Obviously, Guide is the most important program one could be running
(at least in my opinion!), but it would still be nice if other
programs responded to your mouse wheel in a decent way.

(2) When you move the wheel on this mouse, do you get a series
of clicks, or does the mouse move in a smooth manner?

Before Vista came out, Windows treated mouse wheel movement as a
series of steps. If you moved the mouse wheel by a third of a step,
and did this three times, Windows would just tell a program: "The
wheel moved by one step."

With Vista, a program might instead get three messages, telling
it that the mouse had moved a third of a step. It's not an important
point for most mice. Every wheel mouse I've ever used had a wheel that
moved one (non-fractional) step at a time. But it sounds as if maybe
you have a smoothly moving wheel, and Guide is responding to every
fractional step as if it were a complete one.

I've posted a slightly revised version at

http://www.projectpluto.com/new.htm

that will instead add up those small steps, and only zoom in or
out when you reach a "full" step. (Note that I've not revised 'new.htm'
yet. But the version date in Guide will read 2011 March 8 after you
install the update.)

If that fails to fix the issue, then you can "desensitize" the
mouse wheel by hitting Alt-J and entering

WHEEL=240

This will make it half as sensitive as the default (120 wheel mouse
units). Of course, if the wheel is just driving you crazy and you
never intend to use it, you could set

WHEEL=10000

and you could be pretty confident that the wheel would never move
enough to cause trouble.

-- Bill