1)Open map you want to edit in Standalone RTH v2.
2)Open map you want to edit in Entity or any map editor that closes the map while it's not writing/reading to it
3)Connect to your debug xbox in Standalone RTH v2
4)Select the tag you want to edit in Standalone RTH v2 in order to "save the original state"
5)Select the tag you want to edit in you map editor and make changes to it
6)Sync  with Standalone RTH v2

To edit other tags, but make sure you follow steps 4-6 again

Good luck and happy modding.  Hopefully this works for everyone.
I did test it a little bit until I got it to work for me, so hopefully it's bug free, but I doubt it.