Resource utilization is in fact not a true Agile method. Trust in teams makes a safe assumption that teams are sufficiently motivated to spent the time needed to achieve the sprint goals. If you want to go with form of time based tracking, may be GreenHopper is not the best for that. Try Tempo.
I'm afraid there isn't such report. The only reports available for Greenhopper are the ones listed at Using Report Mode. If you wish to have such report available, I'd suggest you raise an issue at http://jira.atlassian.com, this way our developers can be aware of the features that our customers are missing.
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