Mirror geometry & turn on symmetry

Normally in sub'd modelling you would model half the object, mirror it and turn on symmetry to do further tweaking of the mesh.

It would be nice to have a simple tool in Nvil to do this. The process currently requires a lot of steps and obscure tools to get symmetry to work.

See this post for more info
http://voidworld.cmcproductions.co.uk/index.php/topic,2639.0.html

I think it is already very easy check this video:
http://youtu.be/8VBxQaL-aXc