I want to able to add tasks at the top. I work top-down and would like to be able to add tasks at the top. They are always inserted at the bottom, and then I have to drag it to the top. I would suggest the default location to be a configurable setting because other people work bottom-up.
I also want to add tasks in the middle using something like a "add above this task" or "add below this task". This would allow me to keep the current prioritized items and insert a new task relative to other items in that list.