We have independent design teams working with projects and we don't want changes to take place at more than one place. So multi-checkout is erroneous. Because they work with lots of data, sight check (whether some objects are checked out) is not smart.
New feature since Windchill 10.0 is checkout of objects from PDM into more than one project. We need the old feature "checkout into only one project".
Perhaps a preference can control the checkout into project feature.