Hi,

If you try to encrypt a message to an untrusted key, GPG ordinarily prompts you
("Are you sure?"). In batch mode, however, it always defaults to no. An option
that lets this always default to yes (whether in interactive or in batch mode)
would be handy.

This is of course only for untrusted keys, or undefined-trust keys. Revoked or
expired keys should remain unaffected by such a feature.