Actually, the Volume controls do gray out (un-enable) when their corresponding box is un-checkmarked - it's just very hard to see. If you watch the little knob carefully, you can see it. On the other two you mentioned, I also manually gray out the enclosing rectangles to call more attention to them, but I can't do that on the Volume sliders, because there are two of them in it, and only one might be de-activated.
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