We've recently added a new Account Management module to feedly.
You can now link various logins (Facebook, Twitter, Google oAuth...) to point to 1 single feedly account. This should simplify the login process and make sure you always get access to all your feeds, regardless of the login method that you use.
Your Pro membership will be synchronised across logins as well.
To add login methods to your feedly account, go to http://feedly.com/i/logins
We've also published a full blog post with more details and explanations: http://blog.feedly.com/2014/11/29/the-right-login/