Here are some existing threads covering your questions:
Please note that we recommend asking one question, or submitting one feedback per thread to help to keep the Forum as tidy as possible I’ve gone ahead and closed this thread, but you’re welcome to engage on these existing threads or in the rest of the Forum!
If there is anything else I can do to help, let me know!
The problem with Tab-N is that you have to know beforehand if you want it to be a task or section. Sometimes a task becomes a section in which case you’ll have to create a new section and copy and paste the task into the section and vice versa.
Space bar will do for empty tasks.
Will you also add sections to task details (where you add subtasks)?
Other users have mentioned the fact they don’t always know in advance when a task needs to be converted into a subtask; our team will definitely keep it in mind for future updates.
Sections are available for subtasks, however, you first need to create a subtask before you can create a section in subtasks; see example below from my own account