Comment 19 for bug 1296425

 > - fix Pulseaudio's self-detection so that it works when the first instance is still initializing

Yes, this is what should happen.

 > As for running Pulseaudio as a specific user, I wonder what would happen when multiple users are logging onto a system at the
 > same time. Would this not create a similar conflict with each user's Pulseaudio trying to use the ALSA devices at the same time?

Only one user can have access to keyboard and screen at the same time, same should go for the sound card. Access to the sound card is handled by logind/consolekit.