In reply to:

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Holding the "Down" button already has a function. A few different ones, actually.

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I thought it only had functions for "Playlists" and for items under that (and outside of menus, of course). I couldn't find anything to say what it would do on "Info", and trying it just gave me the usual key-repeat behaviour.

Perhaps you've got something that's changed since beta3? (In which case, what's the new behaviour?)