Basically, if I need to pull some clay up the inside wall of a pot that is taller than the length of my right hand (which, granted, you shouldn't have to do if you don't make mistakes like I do @_@), then I will touch my left hand to my right forearm somewhere and tuck my elbows into my sides, making an inflexible triangle, which eliminates virtually all gitters as I move my right hand upwards. The only problem with applying this to drawing is that making a stable triangle isn't at all good for any sort of fast sweeping gestures of the arm, though it's very nice for small detail work. When I'm watercoloring details with a small brush I'll often use that. I will also sometimes touch the back end of my brush to my chin while painting for the finest of fine work. This is especially useful in ceramics because it leaves my other hand free to spin the pot when I am applying a band of color.
If I only took the time to focus on improving my gesture technique it wouldn't be a problem. I think most people don't need to use this method. I've just always been challenged in the motor skills department so I took the high road and found ways around it.