I'm not sure that the syndrome could be classified as a stim since it's a syndrome in and of itself. Though 'lower limb motor restlessness' is apparently very common in people on the spectrum. Neurologists have also long suggested that both (individually) may be linked to how the body handles dopamine levels, so perhaps there is a link there, but I'm no neurologist haha.

Also as I type this, my legs are bouncing up and down.