I have a map where I spent quite some time building a base in the starting area only to realize that ore richness was set to 6 for all ores. I would hate to start over but having the richness so high up also feels cheaty. Luckily I've only really used starting area patches so far, so it's possibly easily fixed by regenerating.

using the "Change Map Settings" Mod I reset the richness to 1 and tried "/ros-regenerate" with no effect. I also tried the regenerate terrain mod with no effect.

Is there any way to make rso aware of the changed ore richness and regenerate?

You would need to call this command after changing map settings:
/c remote.call("RSO", "regenConfig")

If you don't want to use command /c for some reason adding/removing of any mod should cause RSO to redo the config automatically.

Thank you so much! that was exactly what I was looking for.