I think he's full of it... but if people want to play with priorities the way he 'recommends', let them play. I doubt they'll see any measurable benefit.
I've already posted references to a discussion on the Hyper-Threading issue. Running multiple consoles in an HT environment could get you a few more points over the long run, but could also delay the submission of folding results.
I've tried most of that on a dual processor W2k machine, but find my standard setup (one graphical client and one console) seem to provide the same output within a few percent. FAH seems to be all about processor speed.
What does that mean?