Calculated metrics in Discover are needlessly difficult to manage because they are not report-suite specific. This is a real problem because my custom event assignment across multiple report suites varies according to the business model for each suite. This is already solved in Site Catalyst. Calculated metrics in Report Suite A are ONLY available in Report Suite A. Hopefully it is easy to bring these rules over to Discover.
When you work with dozens of report suites with almost as many different business models, universal assignment for custom events is impossible. Please apply the same rules for calculated metrics from Site Catalyst to Discover!