How to get consistent stroke thickness when zooming grease pencil? I've noticed that when I am using the Grease pencil with a placement other than "view" the thickness stays the same thickness based on the view in a way that it isn't effected by it's perceived distance from the camera. 

Is there a way to make the stroke thickness remain consistent with its distance from the camera? And as a side note, is there a way to change the thickness to something larger than 10px?
It appears you can get something like this, by enabling "Volumetric Strokes" in your grease pencil palette.


This creates the following effect (reduced opacity for clarity, volumetric is on the right hand side).


The sampled points can be increased by adding subdivision (default is 0 for basic brush) under the stroke quality section in the grease pencil panel. Increased subdivision is only applied to new strokes though.


The volumetric strokes retain their size, regardless of viewport zoom.


Lastly, grease pencil objects are coming to blender 2.80, which will support proper scaling.