Today I made a plugin that converts the new collision group API into features that you can edit directly in studio without having to write to the command line.
With it you can:
Create collision groups by name
Remove collision groups that exist in the game
Configure which collision groups can collide with one another
(in a manner that is totally not a rip off of Unity’s Layer Collision Matrix)
Apply collision groups and see them with SelectionBox key-coloring
Enjoy! Let me know if there are any serious bugs.