A QTE is in many ways, a mini-game event that usually involve pressing several buttons in rapid succession.. (at least to my mind)..
In ME2, what you get is the <i>option</i> of stopping certain conversation's or cutscenes in midflow to perform either a renegade or a paragon style action. You don't have to do it, y ou don't need to do it. It's based around if you want to do it to suit your style of playing.. That's not quick time event. It is however only available for short moments of time before that option passes.. Just like it would in a normal conversation.
To my mind, it almost seems like the way they've been talking about Alpha Protocol having those extra options in conversation trees It's just not part of the "conversation wheel".