Lee sin with protobelt?

It's actually not uncommon for people with a mouse made for gaming to just have them both on their mouse, or even both coded to one button(2+W for instance) on their extra mouse buttons.

Personally I only have a forward/backward button on the side of my mouse, and even those are useful enough. Used to keep 4/E on them when Kat could Ward Hop, and I now keep Q+R on them when I play Diana so I can hit them both at once from my mouse while moving. I keep wards and important item actives on them when I'm playing other champions.

It's Not too difficult to get the combos down even without a gaming mouse, but with one it becomes even easier.

On the main topic - I dunno that you'd ever really need a protobelt on Lee? Maybe release protobelt when it was considered to be a but overtuned, but not the current iteration. Even the release one wouldn't have been necessary, he already has so many mobility tools just between his Q/W/Flash/R(for disengage)