I always do the hand-wringing thing when I talk to someone, except for the times when there is something for me to fidget with. My parents always comment me on it. I also tend to do it often when standing in a place where other people are present, because there's nowhere else to put my hands. I even do it sometimes when walking with both of my hands being free.
On the other hand, I do not have any motor disorders. I can write extremely neatly if needed. My writing was actually selected as the best of the entire class in primary grades. As a child, I've perfected my cursive writing with lots of effort and patience. I've also had to do the Lateinische Ausgangschrift, only the Russian version of it since I've completed up to grade 5 in Russia.
_________________
Leading a double life and loving it (but exhausted).
Likely ADHD instead of what I've been diagnosed with before.