You would think it would not be posible to map hack or do many of the other things that have cropped up in the lifespan of FFXIV. The point is coding is so complex and so many things could possibly go wrong that would not be expected that they want to very very thoroughly test such a change to ensure nothing strange crops up that could somehow under conditions X Y Z cause all CDs to reset when it was not a wipe. Things like this that were not originally worked into the code are more complex to add later and make sure nothing goes wierd, and the worst thing would be to put it in and have some way to reset them that could be found and abused like crazy before it was known to SE and stopped. That is what they dont want, and what we all should not want to happen either.

lets be honest, if your just learning mechanics, you dont need all CDs ready when pulling anyways, and by the time your hitting enrage and know all the mechanics, the wait isnt that long unless there is a long CD that you use right at the end of the fight and plan to use again in the first bit of the fight (which is not common)