i guess this infinite mwheel "spams" the mousewheel super fast, endlessly, once used. there are also mice that have 3-shot-buttons, which perform the left or right mouseclick super fast 3 times in a row to fire weapons that have no delay super fast (e.g.).
such things are always critical for server admins/GMs/DEVs, cause they are hard to detect and most ppl do think its just a feature, thus super legal. especially since a lot of keyboards and mice have scriptable buttons, so you can make your "infinite" keys on your own or automatize other things.
even some addons like decursive, healbot etc were categorized as cheats by many players back in time, because they're automatising a lot, thus a player has
much less to do than he usually would have to. but in the end, they were accepted to be legal. probably because blizz just couldnt stop it at this time and did not want to cut off "legal" addon too.
so sometimes the edge between legal (massivly helping addons) and not legal (slightly helping mouse or keyboard scripts) is really thin and kinda confusing.
i wonder what the devs will answer you here.
edit:
infinite mwheel:
https://www.youtube.com/watch?v=PQ-wnab6iuEi rather thought it would be more like an "lock-on" than actually turning forever