This interview with Matt Enright at Double Fine is all really nice, but at 22:43, he shows how he uses a midi controller to play with shader parameters using physical sliders.  I'm now imagining a small wireless midi controller as "standard issue" with any Realtalk setup, like the keyboard, and adjusting parameters either "keyboard style" by pointing the controller at the parameter, or "wormhole style" by placing a matching token near the parameter...  The dotframe knobs are a lot of fun, but they don't always have the resolution for smooth adjustments.