D'karr
Adventurer
My "fix" for the doubled up defense "problem" an Int-secondary rogue would have would be to allow their Int mod to be used in place of Wis or Cha when determining Will. This would be part of the Int-secondary Rogue Talent, whatever it's name would be. I'd call it "Slippery Mind."
Similarly, for a prescient bard, they could have done something like "Prescient Reflexes," where when you select the Virtue of Prescience you get to add your Wis in place of your Int or Dex when determining your Reflex defense.
I would like to see a Ranger build that uses dexterity instead of strength when using two weapon fighting powers. Very swashbuckly.