File groups, I'm working on. Several people have asked the same question. I'll post something as soon as I have a complete story.

Custom reporting, since these properties are collected just like any other, you can easily and quickly create a view in the Monitoring console. Otherwise, the data is stored into the datawarehouse in the same manner as all the other rules and so, if you've figured out how to query data from there, you can pull this data too. This could be an article too. No one from MS has published a model on how to do this. I've got some custom reports working from data collected, but it was labor to get them going.