I don't know if this is what you want, but it seems a much better solution to me:
Simply create a new gmail label
Move any you want to save to this label
They will then not be visible in your main inbox stream (may need to archive the emails too)
Then create a new shortcut to a gmail label on your desktop.
And voila, you now have easy access to your "saved" emails on both your phone and your pc (or any other device you can access gmail with)