I've started working on this, adding the bug for track-keeping purposes.
Update: We've had working Mac OS X DMG files for a while now. As a nice-to-have addition we could add a nice background logo and the ability to "drag" PulseView into an "install" folder as some other Mac OS X apps allow, keeping the bug open for this one missing feature. Otherwise the DMG files work just fine, though. This is a purely cosmetic addition.