On Mac you can’t use copy and paste in the launcher. This is irritating to say the least as my passwords are all 32 character, randomly generated. I’ve had to log into Facebook on a client machine just to get into the launcher and I am not stoked about that.
Might also want to consider implementing SSO properly. After authentication Facebook gives you the user’s email so you can link it to an existing account. That’s proof positive that they are who they say they are, so requesting the Epic email and password *again *in order to link accounts makes no sense.
Please do some usability testing.