I wonder what the complication is?
Could be it's a sandboxing issue; if the individual apps in question are sandboxed, then WireTap Studio may not be able to access their audio output.
Good thought, but on the other hand, sandboxing hasn't slowed Audio Hijack Pro down, and AHP presumably
accesses the same apps (I've got no way to investigate.), but...perhaps not in the same manner. Would that make a difference?
Edit: Silly question, I presume?