Hunter Autoshot Problem

So i decided to box some hunters and immediately have run into an annoying problem.
Sometimes when i begin to autoshot one won't, not sure if its range or hasn't got the target just quite yet,
similar issues can be seen with casters but you can just spam the button until all are going.
But with autoshot it will cancel if its spammed so what happens is 1 or 2 of my 3 will be autoshooting or canceling autoshot.
Is there a macro out there that will begin autoshot when pressed and not cancel it if pressed again? Thanks.

I believe /cast !Auto Shot corrects that problem.

Patch 2.3.2 (1/8/08 ) /cast will toggle spells again unless the name is prefixed with an exclamation mark, e.g. /castsequence Steady Shot, !Auto Shot