I would absolutely be on board with a SE approved parser. Both for personal/solo use to fine tune a rotation and for raid leader use for a FC premade group.

Keep in mind that 3rd party parsers aren't even an option for those of us on PS3. I'm always striving to optimise my rotation on my DPS classes and would love the tool. In addition I can think of a few specific instances where a static member of my group with very high level gear was struggling with the basic rotation.

The idea of keeping such a useful tool out of our hands because it will be abused by the few who will abuse anything seems overly cautious.