Ele shamans are pretty crappy for progression, since you will certainly be oom in every bossfight and probly even most of the harder trash packs.
 
	In speedruns whatsoever, eles can do really really nice dps. Mages for examples will spend time buffing the raid, handing out water and decursing. You will do none of that. Fights won´t last that long but the time between pulls and the tanks building aggro is enough to refresh your manapool with drinking. If you want to raid as elemental, you might want to offer your raidleader to play resto in progression (already get that sw33t ele loot) and then respecc once the instance is on solid farm, since he would then anyways want to swap out some heals for dps, since otherwise the healers will be bored af :D
 
	 
 
	As stated above spellpen is probly the best stat you can get. Also downranking LB is not really that much of a dps loss compared to the mana spend.