Realistically, who among blenders target audience doesn't have 3 button mouses or a numpad? Numpads have been standard on desktop keyboards since the 80s, and any mouse sold today can at least kinda do middle click by clicking in the scroll wheel. Even a lot of laptops have numpads, and clever use of multitouch can emulate a middle click.

Mostly unrelated, but jesus christ you people are uberfocused on mindshare without stopping to think about who your product would actually be useful for