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One thing I thought of doing was a class-less, but still leveled system where the base was more like the commoner, but with a bunch of feats. You used the feats to customize your character as you see fit. Something like 5 feats at first level, 2 feats at every other level, plus the normal bonus feat at 3rd, 6th, 9th, 12th, 15th, and 18th level. Though since 4e is a 30 level system, that would also be one at 21st, 24th, 27th, and 30th level.