This is an interesting thread. As a video producer, I like to respond to the desires of my viewers. I was told I needed to immobilize the feet better, so I built a set of stocks last fall and I am finally using them. That gives me a chance to tickle a 'lee with less mobility than I have ever had in a video.
I will say this, though, from a practical standpoint; I spent 17 years in the film and TV industry and the one thing that was always avoided on camera was stillness. It might sound like a great idea to tickle a completely immobile 'lee, but it doesn't translate very well onto the screen. After ten seconds, you want to see something moving.
Of course, I will always try to make the models I work with less and less mobile, but I hesitate to go all out because fo the lack of even a little squirming and wiggling.
What do you think?