This will show you how you can save custom settings in a task like message body, default guests, rights.
Go in the share menu or the add task button in order to open the task panel. From there, just make all the changes you want on any item in the window
Check the "Save as new template" box in order to create a new task template.
Please note that this will be helpful to both reuse a complex customized task or simply create your own customized content task.