Theme config per saleschannel
If you want to have more than one saleschannel with the same theme but have a different setting (e.g. primary color) you need to create a copy of the theme, because the theme config is not stored on the saleschannel (where it should be imho).
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Dieter Galambos commented
Isn't this already possible with theme config inheritance?
You create a virtual theme copy that can change specific config settings.
Attached is an example from the Grav theme.
The downside of this approach is that you cannot extend templates. For that, a separate custom plugin is required.
Such config inheritance for fully fletched child themes (that can extend theme templates) has been removed I think.