I know this is probably not the correct upstream, but I just wanted to run it through alsa-devel first to make sure that you don't think this is all madness. :-)

So, one missing piece for userspace (PulseAudio etc) to actually be able to use the jack input devices that ALSA create, is that these devices are accessible by root only. This patch makes the input device nodes accessible by the same users that can access the sound card: the current logged in user, as well as users in the audio group.

One thing I was thinking about, was that the udev-acl rule actually grants read-write access to the input device node, where probably only read access is needed. Is this dangerous?