This action (adding a task to the top of a section) should be possible in our API. The API route is supposed to be POST /sections/<section-id>/addTask which would take task as a required parameter and insert_before and insert_after as optional parameters. However, we never exposed this route because we were (and still are) wary about exposing endpoints that have different behaviors for the two different kinds of “sections.”
Now that we are deprecating task-sections this world becomes drastically simpler. We will eventually be exposing this route, and I’ll update this thread when it’s live in production.