Found this little trick and while it doesn't do much (I can think of ways of using it to do the 45 and 55 in one day and also helping other people without using your own attempt).
1.Find a friend (this part took me ages, apparently I need to shower more).
2.Both walk into the instance.
3.One person uses his key to activate the crystal, leaves the instance and drops the quest.
4.Person then picks up the quest again and walks back into the instance (the other player has held it open). He then activates a second crystal.
5.Repeat steps 3-4 once more and the boss will appear and the second player will still have his key.
Once you complete this quest it won't allow you to do any other level version of this daily quest, so if you pick up two quests before doing anything it means you can then do two instances.
Not a major exploit but it can probably be used to at least get an extra crystal or maybe more Hope this is helpful for some people
*edited subject to show thread contains other exploits and tricks posted by other awesome people