What's the reason for mirage archer cooldown reset if you dodge roll in the wrong time?

It really isn't an op skill, and it's a great idea, but to me it's useless because of that... rolling has no stamina cost or cooldown and it's very important in some fight's.

So.. Unless i'm missing something this "nerf mechanic/condition" could be simply removed, also it would be cool if we could increase the mirror images limit with support gems or like a lot of stats for a build (each 350 dex or smth = +1 illusion limit).

It seems i have made this post in the wrong forum and someone kindly alerted.