Your comments

I would enhance the "Edit Project" dialog that can be opened via right-click so that it looks like a opened action dialog.
Kevin, for small projects with few actions you are right.
But if you think of a bigger project and apply David's five steps of natural planning you will result in a large list of what needs to happen to make the whole thing happen. In the next step you have to decide what should be done next, and who will do it. So generally "next action" is only a part of that list.