- maybe it's because I'm ambidextrous, but still seems to me to be unnecessary... 

But why?  It works fine

Using the middle finger

To click around and

Using the index finger

For drop-down menus

Switching the buttons

Around 'cause you're

Using the other hand

Seems quite unnecessary

As it's not awkward at all

To me, feels as some

Right-handed thinking here

Imagining their use of the

Mouse on the 'wrong side'

Surely it's not a leftie's view