In the Lightroom 2.0 Develop module, there are some very useful shortcut keys you can used for the Treatment panels sliders.

You can rotate through the use of the different sliders by pressing < and >. When you do, the slider you’ve chosen turns white. To change the adjustment of the slider quickly and in precise increments, all you have to do is tap the + and - keys to increase or decrease the slider position by 5 points.

Press Shift and tap the + and - keys and the slider moves in 20 point jumps.

It’s a really nice alternative if your mouse starts acting up. I find it’s also great for quickly experimenting with the interaction these sliders have with one another when you’re correcting an image. You can really get some nice, subtle changes. I also really like it for precisely setting overall Clarity, Vibrance, and Saturation after I’ve adjusted the first four sliders…even if I did the former by dragging them.

Also, it really works fast for me if I keep one hand on the mouse/pen and the other on the + and - keys. Then the quick adjustment is fast and precise and I’m right nearby with the cursor if I want to slide the slider for a subtle change.