It would be really nice to be able to add columns/statuses (ultimately more customization and granularity) at subtask level. Please see attachment for an example.
Unfortunately, at the moment, I can only achieve this by creating a new project (which becomes over-kill sometimes) and then adding tasks for it, or by naming tasks with more/redundant info than needed.
Use case: Let's say inside a project, I have a list called "Documents needed from others".
I would like to create a sublist as "xyz documents" and create subtasks as Org1, Org2 with custom columns/statuses for each subtask (i.e. organization).