Unfortunately since different developers can have different methods for collecting earnings, we haven’t been able to add a general purpose shopping cart at this time. In the future we may explore some options but it’s not a trivial change.
Thanks for replying. However, what you said here is basically the same response I saw on the older posts I found (example). So, regarding any updates, it seems the answer is "no."
At that point, will such a feature ever be implemented? Is there even any effort going into it right now?