Since switching back to kwin from compiz, one of the features I miss most is using ALT-mousewheel to adjust the opacity of a window. Is there a way to do this in kwin?

I though there might be a way to do it through dbus, but I haven't found it yet.

System settings -> Window behavior -> Window actions -> Change the bottom-right dropdown to "Change opacity".

Now when you can Alt+wheel to change the window's opacity.

Thanks! That's what I get for trying to do it the hard way first...