No. You cannot. Amber is designed to listen for the requests your clients send to ask for event signing. No password manager I'm aware of is designed to do that. Don't forget: every thing that happens on nostr is signed. Post a note? Signed. React? Signed. Upload media? Signed. Unsigned events are...

You could sign in with your private key directly everywhere with it like that though.

You could fork an open-source one and add the ability to sign with the stored "password".

A password manager stores your passwords and sends them to the relevant site as is. A cryptographic signer holds your private key and never, under any circumstances, should ever send that anywhere. Instead, when requested by a site, it uses the stored private key to cryptographically sign a messa...