I agree that having this as a user-configurable option (especially if configurable per item) would be nice.
Even having the ability to submit the passkey selection prompt using the Enter key would be an improvement.
FYI, as noted in this comment, Bitwarden is reluctant to implement automatic login for username/password credentials, due to security concerns. However, such concerns may not be as relevant when it comes to passkey login, since the private key would never be exposed.
Unfortunately, I have no more votes to give (and I assume the same is the case for you, since you have not voted for your own request). Maybe this proposal will gain some traction after some votes have been accumulated.