M-Line - Looking for an alternative

We are in Plain Vanilla AutoCAD 2013 and have been using an M-Line style for years to represent a low wall.

Now that we use multiple layouts representing the floor plan, ceiling plan, finish plan etc..and use the layer state manager to manage this,  I would like to have more control over the interior linework of the M-Line.

There are three interior lines and the outer lines. What I would like is to be able to assign different layers to the interior lines so that I can control the color of the layer separately then the outer lines.

In the M-Line settings I only get the option to change the color and linetype.

So....

1) am I missing something with the M-Line styles?

2) is there an alternative to using the M-Line?

Thank you

Michael