Re: address@hidden: Customize value menu doesn't recognize mouse-2]

[Richard Stallman]

    Right now, you can pop the value menu by clicking mouse-2, but you
    cannot select items from that menu with mouse-2, you need to use
    mouse-1 for that.

On GNU/Linux, probably with Lucid menus, I can select from the menu
using any of the three mouse buttons.

      (The latter part happens only on MS-Windows.)

It sounds like a bug in the way menus work in Emacs on Windows.

To make Mouse-2 stop working on buttons in Emacs would be an
incompatible change that would affect all buttons, not just those
that lead to menus.  It would be a step for the worse.
Please leave things alone.