Hey Benytone,
I just started to play around with your rig to look what it was like.
I actually have a few comments and suggestions about it. I'm not a rigging god, but I've used a couple of rigs in my life…
1- You should totally do a digital asset with it to give a control panel to the user…I guess that was probably in your plans anyway

2- You should lock attributes that don't need to be animated or used.
exemple: controllers like “bicep_R” should have scaling and rotation locked.
3- You should have a the neck(aka “spine3”) rotation control.
4-You should also have arms up vectors for rotations of the elbow.
5-Lots of animators like to have FK arms, any plans to had a ik/fk switch?
Also those Ik arms controllers, they should probably be contrained to the “body_tail_rotator”. Actually you back controls should be constrained to it as well.
Ok that's it for now.
This said, I don't know if this was intended to be a finished rig, maybe you got all those figured out already, but, those are a couple of suggestions and I hope they might help…
Cheers, it's always interesting to see people interested by rigs!