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I agree. What about showing an arrow icon before the label and giving it a different cursor on hover (cursor: pointer)? This could look something like this: I used the unicode character "BLACK ...
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#1: Initial revision
I agree. What about showing an arrow icon before the label and giving it a different cursor on hover (`cursor: pointer`)? This could look something like this:  I used the unicode character "BLACK RIGHT-POINTING TRIANGLE" (▶, `▶`) for this. It might be possible to add some JavaScript toggling it to a "BLACK DOWN-POINTING TRIANGLE" (▼, `▼`) when expanded.