Please excuse me for not being too up on WoW macro's, but what prevents MF/IS/wrath from going off at the same time, and when they do, which one does WoW pick?

Imagine a case where MF and IS are both ready to go and both Mapped Key A and Mapped Key B are in step 1. Both will trigger on the next press of Spam Key.If we assume that Mapped Key A always gets triggered before Mapped Key B, and WoW accepts the request to cast MF and doesn't cast IS, you've now put Mapped Key B into step 2 without casting IS. It will not try to cast IS again for another 12s, and you may miss a cycle. This may work perfectly in wow as I'm not 100% up to speed on the mechanism.

Once again, excuse my ignorance of wow, as I haven't played it in over 2 years. The skill queue in lotro is goofy, and the lack of macro support in game means we have to code all the smarts into ISBoxer.