It looks like part of of your reply got cut off but I was able to dig into Overpass a bit. Thanks.

I've made some changes, please see this changeset:
https://www.openstreetmap.org/changeset/173554932

As I was searching for examples I noticed that in that same area there are some stop signs that you have edited that don't have the `stop=minor` tag. I'm assuming those should be tagged similar to the four way stops where you suggested `stop=all`. My changeset includes a couple/few stop signs where I added `stop=minor` with that assumption.