I started playing with an old college buddy on what I would consider my "main" character. This is the character that I plan on beating the game with first. During my first playthrough I have been exploring everything, clicking on everything, and listening to all of the quest and non-quest dialogues, and cinematics (both in-game and cutscene). He was already in Act II and I was finishing up Act I. Because of this he joined my game. I quickly found out that he could skip the quest dialogues on the quests I was doing, which caused me to miss the voice-overs and have to read it plain text style. He also later skipped an in-game cutscene that I hadn't seen before (I believe he was party leader at the time as well).
While playing multiplayer with other people, is there any way to turn in my own quests or prevent the party leader from skipping cutscenes?