gpg-agent: Different TTLs for different keys

[Peter S. May]

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In the stupid gpg-agent tricks department:

Say I have two signing keys.  One of them signs e-mails and one of them
is used by an automated backup process; admittedly not as trustworthy
(which is why I don't want to use my e-mail key) but better than nothing
if my access control holds up otherwise.

I want to set gpg-agent to handle both, but the TTL on the e-mail key
should be 5 minutes and the TTL on the backup key should be indefinite
(I should only have to enter it every time I boot).  Is there a way to
do this?

Thanks
PSM
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