Yes, I tried it after participating in the
freewriters daily prompt, where they suggest you try it, though they first told me about it in my first NaNoWriMo.
Although to be honest I personally find it more stressful than helpful and end up stuck at the keyboard. although you have made me curious I will try your formula.
Haha why then?
I admit that typing is not my strong point and I need to pause when I write. If I use it, I always have the feeling that I'm going to block myself for fear of losing everything.