Sadly, I don't see how players can see anything to report when his opponent uses a respec (or other prohibited macro). It is not like a speed hack which is easily observable.
Going from one set of skills to another set of skills in under 10 seconds while hiding behind a pillar in voidstar. The animations are different for the top tree skills, its pretty damn easy to tell.
Some of it is "This looks too clean and perfect" but at the same time, I uber speed click 3 mouse buttons and toggle shift back and forth to get stuff thats normally on GCD to fire, so it would look the same even in their logging.
But really? Their feeds and recordings are pretty telling when you see em do it.
Mostly, people just wont post feeds and I wish BW luck in enforcement.