Space, Folder, and/or lists should be able to have "universal properties" that cascade down. For instance, we'd love to keep track of a client's contact info, first name, the location of their cloud documents or website, etc. If you could set custom fields as properties that are true of an entire project, then not only would this auto-fill the info throughout ALL the tasks of a given space, folder, or list, but it would also allow these properties to be easily used in Automations (for instance, automatically emailing [client email] at a specific point in the project)