--can be considered a sub-type of motor neuropathy, in a sense, though most motor neuropathies show definite damage to the nerves themselves, and that has yet to be found in RLS (or the new designation, Willis-Ekbom).

It seems to be more a condition of improper neurotransmitter balance than of nerve damage per se. (There are a lot of neurotransmitter or neuromuscular junction conditions out there that do not involve damage to the actual nerve CELLS or tracts.) The fact that iron imbalance may play a role might support considering it a neuropathy, though.