Comment 2 for bug 524541

https://wiki.ubuntu.com/SoundMenu#Output%20volume%20item says:
"The item should highlight when navigated to, or on mouseover, just as normal menu items do, but the item should not be activatable (clicking it or pressing Enter should not close the menu)"

ok. The playback controls are the second example of horizontally arranged menu items / controls. For the playback controls, the spec says:
"When using the keyboard, the Play/Pause button alone should highlight in the same way. Pressing the Space key should visibly activate the Play/Pause button, and the Left and Right keys should visibly activate the Previous and Next buttons respectively."

wouldn't it be consistent to do the same thing with the volume item?
i.e. to "visibly activate" the Volume_To_Zero button upon CTRL+LEFT and the Volume_To_Max button upon CTRL+RIGHT?

This would mean that ONLY the fader would receive visible focus when navigated to or on hover..
Wouldn't that be easier also?