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I'm using the Field Formatter Class module and it would be nice to have the core DS fields (the ones that show up when you select a layout) to allow other modules to alter the "field's" settings. Maybe just adding them somehow to the list when field_info_instance_settings() is called might be appropriate?
I'll also mention that we're seeing some some weird warnings if using DS core fields:
The only other issue I could find that might somewhat resemble this issue: