May I ask why you, or anyone, would want to do this? If I get a public key with a signature from someone who's key I have verified and who I trust to check keys properly, then why should it matter to me if that signature has expired or not? It still means the same thing; that the person who signed it has verified the key she/he signed.
Well if I know that the person is lazy, and keeps the key on an unsecure computer and it is likely that within one year the key will be compromized, I would sign with a one year expiration date. Basicly this indicates that the person that signed the key does not trust that the key will still be uncompromized after the date of expiration.
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