Have you the submitted the feature request yet?
I’d love to see a generalized version of this. Not just the ability to have new tasks start at the bottom, but rather a system for users to just be able to create their own rules for where tasks land based on any data that exists for a specific task.
So, when creating a new task in a certain project, that project could have a rule that determines which section that task is placed in (and maybe how it is sorted among existing tasks in that section). In your case, the rule would be something like “all new tasks assigned to the Backlog project get placed in Unprioritized section.”
There could also be rules that say things like, when a task in Unprioritized section meets certain conditions, move to a “Need to prioritize soon” section (based on due dates, who it is assigned to, other fields, etc.)
I would love to see this functionality for specific projects and for the My Tasks list. As far as I can tell, there are two of these rules that exist by default in My Tasks: move from Later to Upcoming when due date is one week away; and move from Later to Today when due date is one day away.
I’d love the ability to create and modify such rules for My Tasks or any project.