Well, I am of the opinion that there should not be a single CC resist. I think there should be CC resist for physical attacks (knockdown, etc), and CC resist for magical attacks (charm, etc). I think I should be able to build a character (and the associated defensive resists) for particular types of CC.
Regardless, whether one CC resist value, or two), some UI feedback would be nice. I don't see why CC resist cannot be your physical/magical absord value (+ other sources such as defensive attributes, etc).