Rotation framework design

So not really a memory editing direct topic but more of a brainstorm/question. With the time between now and Legion I'd like to try and rewrite my rotation bot frame work. Currently I unlock LUA, register my own functions and have a custom addon deal with the rotation tick. Currently though its very basic. It just follows the following structure:

While this work its clearly very inefficient and not optimal. An example problem is say doing a rogue burst rotation you want to do deathfromabove->vanish->envenom. However, I also have a check to feint if I'm taking damage. If feint is used it messes up the energy, the rotation and produces unwanted behavior. How would one go about making a better framework? I've looked at something like probably engine and it has some nice features but I also feel that it is limited in ways as well.

Just want to start a discussion see what others suggest/are using.

Thanks,
Ace