well, personally I don't like the idea of getting rep just for being good at building with Legos. I think rep should be reserved for special things. Also, I think it should be more about building from scratch, not redesigning existing sets.
Build what you WILL, that option is wide open, as for rep awarding talent, incentive is all in life, if you don't have incentive, you're going nowhere. BTW herochild, what defines special to you, let's hear it for once, you kids keep talking about rules and regulations, yet you lack the experience to back up a challenge, I submit. BTW, what the brick is not special about being a good Lego Modeller