UPDATE: I just figured out that PS10/CS3 (but NOT PS11/CS4), Gimp, and the Corel products, SketchPad and Painter WILL recognize pressure sensitivity simply by installing either the TabletPC or consumer tablet drivers WITHOUT a restart AND this leaves ArtRage and Sketchbook Pro still sensitive as well! But the trick is not reversible. i.e. you can't immediately uninstall the Wacom driver without a restart expecting to get CS4, Twisted Brush, and InkBall working again. But I think I can live with this until a real solution arrives!
Messing around with the Pen and Touch or Pen Tablet Properties control panels did not achieve anything worth noting. But don't let that stop you from trying
On an unrelated note, I forgot to mention that the Authentec drivers work just fine for the thumbprint reader However, there is no longer support for using it as a scrollbar while surfing. No great loss. This feature never worked consistently for me in XP anyway.