add non-facebook friends

1) No, JFBConnect doesn't manage on-site friends in anyway. If you want a 'social' experience on your site, we'd recommend something like JomSocial or Community Builder. JFBConnect helps connect your site to Facebook and increases engagement and visibility. It's not an on-site community extension. JomSocial or CB are great at that, where we're great at the Facebook interactions.
2) No. A Request is simply a way for a user to send a message to their friends. When a user Accepts, they are simply redirected to a page on your site that you define. It's not personalized request that can have options.. the user either accepts (goes to the site URL) or doesn't (ignores entirely). That's how Facebook has things working, and we have no ability to customize the 'action' buttons presented to the user which are "Accept" and "Ignore"
3) No, we don't provide fee-based custom code. We gladly help our subscribers implement new features as much as we can. Almost all new features over the last year or so have been suggestions from users that we've helped implement on their site (for free) and then rolled into subsequent releases to make better.

Hope that helps explain!
Alex