After discussion on the ML and on IRC, it's come to my attention that community packages should not carry optional AUR dependencies. I currently maintain uqm-sound, an optional dependency for uqm. I fairly recently fished it out of the AUR archive after being orphaned by AUR4, so it spent a good deal of time not even existing in the AUR at all.

I'd be happy to give up uqm-sound to a TU if it gets pulled it into community, or otherwise continue to maintain it if uqm gets knocked to the AUR. (One way or the other, uqm-sound probably needs a licence change; it was set as GPL by the prior maintainer, but I'm pretty sure the two packs it includes are a CC licence. I was planning on just waiting until an upstream release to change it and avoid a pkgrel bump, but it bugs me and there hasn't been a release in three years anyway.)