Auto login using omniauth provider

Is there any way to make auto login possible? Right now I can redirect unauthorized users to some url, but I can't redirect them to /users/auth/PROVIDER because it must be a POST request, not GET.

I see two ways:

1. It may be an option on system settings page like "Enable auto login through provider: " and select box with auth providers.
2. It may be a check box after setting 'Home page url' on system settings page like 'do POST redirect'.

It would be great if you could add this feature!

Can I hope to see this feature realized?

P.S. Sorry for my english =)