It sounds like a great idea and I hope bungie does add a little extra along these lines into Destiny. Maybe not so much freedom with the damage type but perk re-rolls would be great and being able to upgrade those awesome 300 weapons would be amazing.
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Agreed. In addition to exotics, raid weapons should perhaps be limited as well. No perk rerolls but maybe just damage value upgrades? Due to the fact that raid weapons have unique properties as well