This may be relevant for other actions, but I’d love to see the ability to automatically add a subtask created in a rule to its own project - allowing it to become a “parent task” within its own project, as well as a subtask. This would offer flexibility for task management within a project, as well as opportunities for improved task transparency.
Specifically, within a Project Template, there’s no native method for a Rule to create a subtask that is multi-homed to its own project. There’s only the option to multi-home the subtask to an existing project.