I looked around for this but found nothing. Some people my know this but im just sharing it. So basically in LFR when it comes time to roll for items that dropped you can click to leave the instance and rezone and it will reset the timer on your roll. This can work if you want to wait out the last boss for loot and wait for everyone else to leave, of course waiting is annoying but if you REALLY want that item from the last boss and dont want to wait till next week, im sure a few hours wont hurt lol.
If someone else posted this and i didnt see it. you can delete this.