A context menu already exists in the About dialog with “Select All” and “Copy” options.
The dialog already has a bit of clutter with “About”, “Credits” and “License” buttons (that act like tabs) in Linux. And “Credits”, “License”, and “Close” buttons in Windows.
I’m not certain a Button would help much. Because this would create a button that does not appear to DO anything. It could copy the data to the Clipboard. (That is an action which is “silent”. No feedback in the GUI.) But then what? It could not reliably create a Discourse posting because that requires the user to have an account and be logged in. The same with the MantisBT issue reporter.
I suppose that it could do a “Mailto:” and put the data in the body with a pre-defined subject. Or even include links to Discourse, MantisBT, and/or the User Maillist. But that would probably amplify confusion.