Hi,
This is an addon i wrote for blender 2.79 that helps with creating bones at selected vertices. Basically you can select some vertices then click button at bottom for it to create bones.
its still a work in progress, modify and use at your own risk. but some of the code may be helpful like it uses some enum properties etc. it also has an option to use the vertex selection order when creating the bones. and it also has option for the direction the created bone tail should be facing.
Here are a couple examples of its usage:
Happy Scripting! and Happy Sketching!
Nate
