[J0-nas]

No idea.

I can only speak for myself. But in now 7 years I never connected a keyboard or mouse to my 2011 MBA. It's keyboard+Touchpad is just so good that I don't need it. Even when I connect to an external display.

I'd say no. In my experience other Companies aren't even able to recreate the smooth surface + 'clicking feel' of the Apple touchpad, which is what I value the most. I suspect that they can, but aren't legally allowed due to patterns.