I run 2 groups, each with 4 different classes at the moment so I can understand your need for choosing quest rewards. But for me this really depends on the rewards of the quest. Sometimes the rewards are just useless for everyone and in that case I would like to do only 1 click instead of picking all of them manually. While for other quests I'd pick one manually for all characters. So for that matter I don't mind taking a bit longer choosing out quest rewards.

You should look through this thread a bit:
http://www.dual-boxing.com/forums/in...+quest+options

It is about the new quest option screen for the next Jamba version.