My wife played C&C for the first time this weekend. She thought this above concept was odd, in concept. She thought it even more odd in practice - I allowed my older son, playing a mage, to react to an approaching bandit by using the evade maneuver. He hadn't acted yet, and was in the process of casting a sleep spell. A bandit approaced him, and he asked me if he could abandon the spell to evade the incoming bandit (he was down to 2 hp). I allowed it - in my game I allow Dodge and Evade to "interrupt" the flow of combat and to be done in reaction to events that unfold.
Though my wife didn't verbalize it, I think she thought it odd that some actions were able to interrupt combat. I tried to explain to her that AoO's did that in d20 (her only experience up till now) and it wasn't that odd. She later said that she liked the "declarefirst, then act" method of combat rounds. But I think she initially I was playing it "wrong."
So, I thought it might be a good topic for discussion - interruptable actions in C&C combat. Do you guys use these actions this way? If not, how do you use them? Do you use them at all? Do you have other actions that interrupt the combat round?