weight painting can't go through objects

[diyarjabar0111]

hello, I have two questions. 
first one, how can weight panting go through the objects?.in blender you will turn off front faces only and change the brush to projected. but I don't know if maya can do that?

the second question, is that how can i make the left arm move with the right arm while I'm moving them? I mean I want both hands and legs have the same location, and rotation.

[grendizerus]

I don't know why you want to paint on the back faces? It's better to paint on waht you see in front of you.

In Maya you can link joints rotation through driven keys or expressions, but you don't really need to, as you usually paint on the left side of the character then mirror skin weights.