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I don't know of any native way to add or edit the enum in this view but you can definitely do some customization to your "Comments" pane to allow it. The code for the comment pane in Scripts/app/editor/eventdetails. You'll want to use the PI Web API to make the changes to the attribute. Keep in mind that you're making this change for all comment panels so if you introduce any errors or poorly optimized code you will effect performance globally.