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You're breaking my heart.  Pick a file name (how about
reserving 'f'?) Select IDLE's autosave feature in the
Options dialog.  When you F5 a new edit window, and
the Source Must be Saved dialog comes up, hit enter,
type an 'f', hit enter.  Three keystrokes.  

Maybe sometime I'll remove the Source Must be Saved
dialog if IDLE is set to Autosave, then it would be two
keystrokes.

The downside to implementing this is some poor soul
is going to lose significant work that he thought was
saved.  Guido wan't even very happy with Autosave,
though I love it.