Hi
I don't think there are any effective easy ways to paint
NMM - it requires blending over the entire model.
Things like flow aid and wet blending could certainly speed it up, but you are still blending on every panel independantly.
As far as metalics go - you can get some lovely metal effects with metalic paints - combining some of the
NMM techniques with metalic paints.
Check out this one for the extreme of using metalics to good effect (Gold award at France's
GD):
(taken from
http://www.coolminiornot.com/52474)