A marker next to the samples in the project sample pool that are being used, including samples that are not assigned to any track but still are being used via parameter locking, and so on.
This should probably be indicated on the +Drive as well, a tiny marker next to all samples that are being used by any project.
Another marker to indicate samples that are connected to sounds stored on the +Drive, will likely lessen the risk of someone getting a stroke as well.
Or something similar. I'm thinking much of it can be handled via librarians on tablets and computers, but having a proper working sample management on the actual box should take priority here (imo). That shall be all. Carry on, soldiers!