xfwm4 has a mousewheel-rollup feature, which is enabled by default. In my opinion it would be better if this feature would be *disabled* by default.

The mousewheel-rollup feature causes many complaints from people who inadvertently perform a rollup of the active window, and then think that their application window has suddenly closed. Or they see the rolled-up window bar, but don't know how to restore it...

I've never met anyone who actually uses the mousewheel-rollup on purpose, but I've heard many complaints from people about involuntary mousewheel-rollups. So changing the default to "disabled" seems an improvement to me. Experienced users can always enable it if they want to.