What the OP was asking about was embedding the image and not having to click on the attachment box that shows when you fail to choose an embed option. I think that's what Andy is referring to - that add-on apparently forces an embed option to occur. It's basically an answer to a problem that really doesn't exist since some people may NOT want their images embedded and that add-on forces it no matter what the user wants to do.
The better answer is teaching your users how to use the software as designed so that you have both capabilities (which is what my post was targeted to do).
All it is, is a remove-all add-on that removes an option that can (and should) be left to the user on how they want it displayed. It's a a solution to a problem that doesn't really exist - it's called instructing your users on how to embed posts compared to just adding them as attachments.