Helpinator allows you to create and manage to-do lists - both for individual topics and the project as a whole. Using this little feature you are able to:
There are two places to work with tasks:
1. "ToDo" tab at the bottom of the topic editor. This tab allows to add/manage tasks assigned to this topic.
2. Global project to-do list with all tasks from all topics and the project itself.
To add a task for the project itself, not a topic, click "Add" in this global list.
There's also a way to get printed version of your tasks list. Locate "Tasks by topics" report under "Reports" node and run it.