Well, most of it is already there in one form or another... As far as I can see, what you want is basically take the cover browser, give it the same drag n drop abilities as the main list, and make it two-dimensional (several horizontal levels instead of just the one). Or maybe start from the cover grid and give it a cover browser look and feel?
That's _really_ non-trivial, for a basically trivial use. I guess it could be a fun project for a 3D-oriented GUI plugin, but given dev resources, better focus on functionality rather than eye candy. Gotta keep your priorities straight.
"Cool app! Can I do X?"
"No."
"Then can I do Y?"
"No, sorry."
"...Z?"
"Nope."
"Okay, what _can_ I do?"
"Not much at all, but it'll look cool while doing it."
Not really appealing.
N.
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