Background: I often will create several designs on a single sheet when they have a common theme so I can keep a consistent theme. Once finished I like to save them individually for import into Publisher or whatever I'm working on. It would be nice to be able to have a "Save Selection As..." option to allow for quick export.
Current method: Select the elements desired. Copy (CTRL+C). New From Clipboard (CTRL+ALT+SHIFT+N). Then "Save As..." on the new document (CTRL+SHIFT+S) and close it. This creates a correctly sized document that can be pulled with ease into Publisher. I actually use AutoHotKey to do this all with CTRL+F12 but a built in way would be nice.
Proposed method: User highlights what they want. Under "File" two new menu options are present. "Save Selection As..." and "Export Selection As..." in case you want to export a SVG. This could possibly be under the "Selection" menu but saving files seems more logical under "File".