Well one you have shaped it out just convert the model to poly - game engines dont use nurbs as they are too heavy. You can keep the nurbs object connected to the poly too as long as you dont delete the history

ahh you have turned on soft selection by hitting the B key. To turn it off hit B again.

also if you double click the tool you are using and go to its settings, you can scroll down and turn on soft selection here as well.

hope that helps

Jay