Let me know if I can close the bug, even though it's not exactly what you've asked for (though the functionality is the same, but your request is not possible because it would break Unity Dropbox Share - you wouldn't be able to upload files anymore if some command would be assigned to the actual launcher).
I've added an Unity quicklist for re-copying the last URL. Here's a screenshot: https:/ /lh4.googleuser content. com/-oOIMy8NQZE Y/Tnmz5RHhCgI/ AAAAAAAAGAc/ VBavxegUwrk/ unity-dropbox- share.png
Let me know if I can close the bug, even though it's not exactly what you've asked for (though the functionality is the same, but your request is not possible because it would break Unity Dropbox Share - you wouldn't be able to upload files anymore if some command would be assigned to the actual launcher).