It's nice to improve the gameplay using several techniques, but my personal belief is that it's a nice experience to play it like the developers intended.
Then, we can stop if our skills ar not enough (it happened to me a lot of times), but at least I give it a try at first.
In the case of CVA, I could finish it without cheating. Some other times, like with Circle of the Moon arena stage, or some extra modes like Albus Mode in OoE, Max LV 1 in PoR, or The Forgotten One in LoI, I just couldn't do it.