Does wearing medium or heavy armor have any penalties for a barbarian? I can't find the answer anyhwere in the manual and my barb can use all armor but I am thinking there is probably a penalty of some sort. Also, is it worth taking 2 levels of barbarian for my fighter to get faster movement speed and uncanny dodge if I will be wearing medium-heavy armor?
Oh and one more thing, are there any class specific quests in the game? (Specifically for Rangers).
The only thing I can suggest is mess with your character info sheet and try different armor. Keep checking it to see if anything changes.
About the special quests...I don't think so. IWD 1 was all about 6 characters just going through the dungeons and I think IWD 2 is the same.
Hope that helped.