Hi
Thank you for getting back to us.
In regarding the my certificate category, the issue is about the certificate itself. Please check the below to make sure it is in correct format:
https://superuser.com/questions/936840/add-to-my-certificates-in-keychain-access-mac-os-10-10
Also, all keychains will have the same categories and this is by Apple's design. We are introducing a PIN-protected keychain and it will also have the categores like "My Certificates".
Moreover, in regarding acessing the protected keychain with the PIN unlock, you will need to use the application itself to unlock it rather than the user who logged in.
We will also file the request for enhancement of this case to our PM and will keep you posted. Thanks.
Regards,
Albert