I'm not so sure it would be as useful for PvP, though I've seen a lot of people pull significantly low damage numbers, as shown at the end of matches. But damage in PvP is still generally about bursts at the right time more than standard rotations. You've also got to factor in mitigation and cc skills, as well as skills that perhaps lower an opponent's damage as well.

It's not a bad idea, but just as easily, learn your job's burst rotation and how to manage/stay active in between burst windows, and you should have no issues at all.