importing keys with expired signatures into gnupg

[vedaal@hush.com]

recently there was a description about about v3 key with an expired signature,
 causing a problem with its importation into gnupg

[1] is this only for v3 keys, or all key types ?

[2] can this be maliciously exploited by signing a key with a signature
set to expire for the next day, uploading the key, and then causing difficulty
for anyone trying to import it?

{yet another reason for not allowing signatures without the keyowner's
permission ? }

tia,

with Respect,

vedaal 



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