I tried to use pinentry-gnome3 as a replacement for gnome-keyring-daemon's
gpg-agent. I ran into an issue that is a show stopper for me, but should be a
trivial thing to fix.

pinentry-gnome3 offers the option to cache the password in secret storage,
however it uses the default "login" collection rather than the "session"
collection which is cleared on log-out.

I do not feel comfortable keeping my gpg password saved in the "login"
collection. I would feel much more comfortable with it cached in the "session"
collection like gnome-keyring-daemon does.

To store in the session collection, you just specify SECRET_COLLECTION_SESSION
instead of SECRET_COLLECTION_DEFAULT when storing the password.

For feature parity with gnome-keyring-daemon the behavior would be to cache in
session storage unless the checkbox is checked, in which case you would store in
the default collection.

Current behavior of pinentry is to not cache the password at all by default.
When the box is checked, the password is stored in the default "login" keyring.

I would be happy with either matching gnome-keyring-daemon's behavior or even
just providing me a way to cache in the session storage.