2...Na6!? in the Sicillian

I was playing a friendly match and suddenly this popped out at me. 

As you can see Black has a rather passive position and I played Nxe5, whereapon he slipped up with dxc3? and I played Nxf7, winning material.

But what I want to ask is:is the idea of 2...Na6, with moves like Nc7, covering b5 from the knight and allowing the pawn advance d5, valid?

I think it's a fairly strong novelty that can be used as a surprise weapon(I haven't peered into any tactics or analysis as yet, so there may well be a line that wins a free pawn for White or something; I'm assuming there's no such line) in fast-paced games. 

I used to play 2...Na6 with the idea ...Nc5 to pressure the e4 pawn.

Conzipe, what about supporting a b7-b5 pawn push to attack the queenside? 

Let's make it happen!