Brad Frost gave examples that allowed me to figure out just which settings were needed to get scrolling and a fixed title to work on android 2.3.
With this out of the way, adding a new task form was easy. A [+] button in the upper right now allows adding new tasks at any point. The form picks up the right project from the context where it is called or defaults to "inbox". We can enter a title and a description, and the category buttons below double as submit buttons for now. We can even create a new project if we change the name. (The new project won't show up in the list yet though)
With that it is now possible to start using this tool and we can feed actual user experience into the development process.