No, no, no, no... did no-one learned the lessons of BG2 with it's "XP for everything" mentality causing horrible problems, and guiding people into doing things they normally wouldn't do (picklock door having key, CHECK! :/)
@ Meme; good point.
That's were you make using a skill only level up the skill used. Using lockpick levels up lockpick. Using blacksmithing levels up blacksmithing. Its actually kind of odd they didn't go that way given the whole classless system. Usually those go hand in hand with skill based systems.