As for bosses they need to be killed period. I don't understand why Bioware did not create a mechanic that requires you to kill all.
A while back i did a Black Talon HM run on a fresh 50 alt, already had a lot of custom gear and 50 mods, but needed more upgrades. The tank didn't want to kill all bosses so we skipped two. I really wanted to kill them as i needed the crafting mat. The tank said he didn't need it, yet when we killed the last boss and the mat dropped there, he needed on it. Have people gone mad?
Seriously this is an MMO, a social game, please stop being selfish.
Yes that is why I write here, I have seen this disturbing behaviour a while now. Players that expects "fast runs" from the start in heroic flashpoints and when they dont get that they either leave or start a drama about it. What is 5 extra minutes compared to a good upgrade for a player.......