[idea] no pop-up login. but this is still only 1 Button.

The JFBConnect 'popup' isn't a separate popup window. It's fully customizable with CSS and you could make it look like the image you posted above with a little work. We have a full theming system for the SCLogin module which you can use to create, or override, the styles and layout for our popup however you'd like it to look and work. For more information, see:
www.sourcecoast.com/sclogin/documentation/themes

We have plans to add additional themes for our SCLogin module, in addition to the 'SourceCoast' and 'Default' themes available right now.

I hope that helps, and if you come up with some good styles or layouts that you like, please feel free to share them back to us.

Thanks,
Alex