The odds that an actor needs you to tell them to toy with a napkin or scratch their forehead at a given moment in the story are vanishingly small.
It’s also not very interesting to read. Little meaningless details don’t belong in the script at all.
The exception is when a character’s tic or physical habits are necessary to the story. Avoid parenthetical instructions as much as possible, use them only for clarification, rather than directing a performance.