Sorry, didn't really explain myself very well. Instead of rebuilding the existing packages I'm just creating separate packages with the components I require to support Pulseaudio!
Thankfully all the things I require (the Pulseaudio plugins from gst-plugins-good and alsa-plugins and the volume control mixer and applet from gnome-media) can be installed independently of the parent packages so I can affectively isolate Pulseaudio (from a dependencies point of view) without harming anything else.
This way if you install gst-plugins-good, alsa-plugins (I'm building this too) or gnome-media you wont accidentally install Pulseaudio if you don't want it.
Does this make sense?
The packages I'm working on are here: http://people.salixos.org/pwatk/packages/pending/