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Seriously, this is the only functionality missing that's keeping me from completely switching from iTunes to Enqueue.

I'd have to agree with this. I also use the iTunes music store, so it'd be nice if Enqueue kept up to date with music downloads (and synced music imports to Enqueue back to iTunes too).

Or make Enqueue use the iTunes library directly, as Simplier[^1] does.

[^1]: http://itunes.apple.com/us/app/simplier/id467077932?mt=12