1) At the end of your subscription period, everything will work just as it was the day before. You can continue to change configuration options and nothing will blowup like pumpkin after midnight. The only things that you'll loose after your subscription ends are:
* Access to new updates
* Access to our automatic configuration tool and error checker built-in to JFBConnect
* Priority support in the forums
All features will continue working as normal. At times, Facebook will make changes that will break older versions of JFBConnect. As those happen, if you don't upgrade, some features may start to break. That's not normal, and only affects about one feature every 2 months or so. If you aren't using those features, you won't even notice. Many users have very old versions of JFBConnect installed and working just fine on their sites and that's fine by us!
2) Depends on what you mean by "Sending an image". For a user to post something to their wall, you can simply implement a Like button. If the image has a unique URL for the page it's displayed on, all you'd need to do is make sure the Open Graph image, title, and description for that page/URL are correct. When the user clicks the Like button, it will get posted to their wall (they will also have the option to post a comment about the image). That will also add the social sharing features that others can Like the image and it may show on their walls as well.
That's by far the easiest way to post to a user's wall. There are other options as well that you could use from Facebook, but it would require a little PHP code to implement. We have a dev guide I can point you to for that, and could give some pointers along the way. It really just depends on exactly what and how you want the sharing to their wall to occur.
Hope that helps, and no problems for the patience. Facebook integration shouldn't just be cobbled together and thrown on a site. Well thought out design is critical, and that's what we're here for. Of course, we also have a 30-day money back guarantee if you purchase and can't implement what you want or aren't happy with it!
Best of luck,
Alex