Bug: mouse wheel controls active slider volume instead of global volume.

I know this has been mentioned before as in http://tweaker.userecho.com/topics/510-volume-control-not-affecting-global-volume-once-focus-in-sndvolexe-has-changed/

Recently I've been using an application that has it's own volume control. Instead of tuning the volume internally, it does so by using the windows volume mixer. That results in every time after I mute / tune volume in that app, I won't be able to change master volume by using mouse wheel over taskbar.

I think a more sensible behavior would be like this:
When the volume mixer is not open, mouse wheel should always change the master volume.
When the volume mixer is open, mouse wheel changes the volume of active slider.

That's because, acting like this would always have visual feedback when changing volume - either the master volume bar pops up or you can see which slider is moving in the open volume mixer. If that's too hard to do, I'd like to have an option to always change master volume.