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Not as of now, but if it is totally blocking you, I will think about implementing it. I skipped it at the beginning because it is takes longer to implement that the single sign-on solutions.

I am thinking about using Auth0 for SteemWatch 2.0, though, where this should be automatically available.

Thanks! I really didnt want to give out my other credentials.

You don't give out any credentials, that is the point of single sign-on. You are authenticated against your account in e.g. Google, but SteemWatch only gets your email, not your credentials. The authentication step is delegated to Google.