Yep, Bonebreaker is my making. And yea, my main focus was simplifying the import/export/rig process, definitely not modular rigs - I like to use re-targeting in engine, mostly.
Sounds like you have a nice update planned. Definitely must have involved a ton of renaming work or parenting work to achieve.
My main focus of late (in blender) was to try and better the automatic weight painting for rigging new stuff. it pretty much sucks no matter what though, it seems to always need fine tuning on hips/elbows/knees no matter what I script into it, or how I re-create the armature to automatically parent. In fact, I got a lot faster at “just doing it” in the end 