You can also join a group to do the level 50 story mode flashpoints. As they are most likely to be level 47 to fresh 50, they are more likely to agree to see the story rather than RAWR do-this-in-20-min-go-go-go.
I did some story mode flashpoints on The Fatman quite a while back and folks were upset if I didn't spacebar everything.
Now that I've started doing story mode on The Harbinger I'm finding folks more reasonable. Perhaps my fear of tyranny of the speed runners