I just noticed that too.
That's just an annoying change.
I just can't see a real reason to separate aim and crouch exept for the one to make crouch work in shooter mode. I think that crouch walk does not work anymore is a byproduct of separating aim and crouch.
Please revert this change back to the original Version :/
I'm not a huge fan of ground combat personally so it's even more annoying that I have to spam the crouch button every time I move. Also, I don't care for how everything I do cancels my roll but rolling cancels nothing. That seems backwards.