I wrote this tool so I wouldn't have keep doing the same things over and over when making my blend shapes.
Its pretty easy to add new stuff just make a new subclass and make sure to implement 3 methods, then add a button to the right side for it. Its on my maya scripts bitbucket as blendshapetoolkit.py
The things the tool does are.

Shrinkwrap: 
The first part I wrote because I wanted my blendshapes to keep the cylindrical nature of the helmet.
It has the option to select only the verts that I want to affect

Arrange:
In order to keep things organized it moves the newly created shape to the next spot.

Materials:
Put a new material on the object with the option to only affect certain faces

Mirror:
For symmetrical meshes mirrors the shape node and moves it to  -x

Blendshape:
Adds the shape to the blendshape node of the target object

not shown in the video are the ability to rearrange the order and to save and load the list.

not quite getting the range i was hoping for.  I used a log scale to get the values to be reasonable in maya and it kinda killed the peaks, but we'll see how it works when I get the audio its going to be used on.