Structure of HTML report

We've just started using MSpec, and the HTML report is one of the things I like most about it - however I can already see that it'll become more difficult to navigate as the number of tests increase.

I was wondering about adding some structure to it. A few ideas I've had:

• A way to see all tags, and for each tag, all contexts that match that tag.
• An index of the subjects
• A way you could group subjects and/or create some kind of subject hierarchy. (Probably just using additional text attributes rather than trying to use class inheritance - so something like [SubjectHierarchy("High Level grouping","Mid Level grouping", "Low level grouping")] which was used to order & group subjects.

From what I can see, the HTML report is generated by xslt from the xml file, so adding Tags/Subject Hierarchy would require altering the XML format to include those. Would this be acceptable?