Touching base on the dual weapons use, I know a ton of folks that took full advantage of the attack powers that were minor actions as their two weapon fighting options. Granted, there was not alot if them, but it was an option.
My personal opinion is that they should have done this with the dual weapons powers of the fighter, ranger, and the barbarian from the beginning instead of multiple attacks as just a standard action. It would have opened the door for more options for players.
I think that's actually one of the big problems of 4e - namely that there's way too much incentive to stack bonuses rather than do one big attack. And R&D had a very shaky implementation of options designed to prevent it from being a problem.
Bonuses should have been limited, small, and per W/I of damage where all other damage listed is extra(and doesn't apply). If a Barbarian gets say +5 damage for a 1W and +30 damage for a 6W, there's some incentive to take that 6W over a 1W+1W+1W power.