Trouble with work item links and model elements in Visual Studio 2010 Ultimate?

This post addresses a limitation in Visual Studio 2010 Ultimate where links between model elements and work items were unidirectional (element to work item). It explains that bidirectional links require installing the Visualization & Modeling Feature Pack. It also details that when a work item link is removed from a model element, the link from the work item to the element is also removed, but the reverse is not true, requiring manual deletion from the element.