Permalink idea

I’d really like to see a field in the edit post screen called “permalink string.”
That way, for an entry titled like “You killed my father, prepare to die” a permalink could be:
/archives/2003/princess-bride
instead of
/archives/2003/you-killed-my-father-prepare
The version I’m recommending (via this new “permalink string” field) would be:
– shorter
– a better summary for readers / linkers
– probably easier to remember for admins, too
– also likely to rank higher in Google
What do you think?