SP Chain's and claiming two mobs at the same time go hand and hand. Being able to claim mulit mobs may pose a different situation however.

Mage burning will become more plausible, and I could see 5-6 mages AOEing a ton of mobs for easy/lazy SP.
However, for Guildleves, like come on...Why can't I claim two mobs at the same time that only I or someone in my pt can hit...seriously.