I wish I could say adding global scaling was a walk in the park, but it was not. Especially with the volumetric IK joints and space switching. However I managed to come up on top and conquered it with multiplication. Below is the result.
One of my personal goals for piper's rigging system was to make it without using any Maya constraints. The byproduct of a constraint-less rig system is a very clean looking hierarchy, woo! It also helps that the Rig class now organizes everything it makes into the rig group(s) ;)