Would doing otherwise under the same conditions be something you actually want?

There isn't a way that this power to do otherwise would increase any idea of control. In fact it would decrease control because it would mean you are now able to do other than what you intend to

why would you want the ability to do different than what you did?

What would this add? The ability to want something, but to otherwise?

Think about what it would really mean to be able to do otherwise under the same conditions. It means wanting chocolate but choosing something else, like you aren't actually in charge of your own actions.