Do you consider that the volume key should do the same thing than when the applet slider is not open then (in which case the bug is a duplicate from the "can't take screenshot with the keyboard key for that when a menu is open" which is due to GTK) or do you think that the multimedia key should act like + and - (that's probably not worth doing because the multimedia key events are not standard, assigned from a capplet and that would make the code complicated for a very special case, you usually either use the multimedia keys without opening the applet slider or use your mouse to interact with the applet)
Do you consider that the volume key should do the same thing than when the applet slider is not open then (in which case the bug is a duplicate from the "can't take screenshot with the keyboard key for that when a menu is open" which is due to GTK) or do you think that the multimedia key should act like + and - (that's probably not worth doing because the multimedia key events are not standard, assigned from a capplet and that would make the code complicated for a very special case, you usually either use the multimedia keys without opening the applet slider or use your mouse to interact with the applet)