I am not sure if these are discovered bugs or feature requests:
The choice of the output method for RAW files (embedded or linked) is only possible when opening the file for the first time. After that, you can get back to the Develop Persona by double-clicking on the RAW layer or by clicking on the "Develop Persona" button in the toolbar. However, the output selection options are then missing. Is this intentional?
Due to point "1." it is not possible to non-destructively edit non-RAW files in the Develop Persona.
RAW layers are not visually marked as such. Only "RAW" appears when you move the mouse over the icon area. But a RAW layer should be clearly and permanently highlighted. I would suggest a marker instead of a symbol - for example, a colored corner or something similar. This is also necessary because double-clicking on the thumbnail of a normal layer, triggers a zoom action.