If I use a custom field for department (as an example) I should be able to set the department custom field of the folder to "department x" and all tasks should inherit that that are created in that folder.
If you have a folder/project for e.g. complaints or other important issues it would be great if it could be marked as important as you can do it with a task. As all new tasks in a folder would inherit the settings of its folder thus being important which helps in giving them special attention in the dahsboard etc.