USE CASE: Mouse wheel support in rxvt-unicode works less than desirably, and you can use the perl extensions to make it work out really well. However, it's impossible to stop the rxvt-unicode's built-in handling of the mouse wheel from taking place through settings. The only way to get rxvt-unicode to ignore the wheel completely, so you can do what you want via the perl extensions without the terminal also doing things on its own, is to disable mouse support. HOW TO FIX: This use flag simply needs to add --disable-mousewheel to the ./configure line of the build. This flag can be omitted by default, but allow people like myself who wish to implement their own wheel functionality to toggle the use flag. By doing this, I will no longer have to build this from source, and can use gentoo's repository. Thanks. Reproducible: Always
Meanwhile, use EXTRA_ECONF="--disable-mousewheel" emerge rxvt-unicode
Thanks for reporting. You now have USE=mousewheel (enabled by default, though) in version 9.11.