It would be great to be able to create a custom progress field or rollup that automatically summarizes the progress based on the tasks related through a specific custom relationship field.

For example, I have a list with "Project Brief" tasks that inform tasks across various lists and folders. I link to those projects through the "Project's Activities" custom relationship. I'd love if there was some sort of rollup or custom field that can show me the progress of the overall project based on the status of related fields.