Filter "Review Coverage" Report, exclude files patterns or filetypes

Working in a corporate environment, numbers are a big deal.
One initiative we are looking to push is code review coverage, and we would like to be able to have metrics to track our performance.

On the surface, the "Review Coverage" Report seemed like a great fit. When we started using it, however, we realized it had problems. Work done in branches is tracked against the main metric.

Ideally we'd like two things:

• Be able to specify particular patterns to ignore
• Be able to ignore specific filetypes (XML)

This would greatly increase the value of this tool for us.