For some of our Topic pages, we would like to specify a site section to which that page's analytics could roll up. Currently, all topic pages' analytics roll up to the /topic/ section, which is not useful. Currently Tag Service offers only 3 fields -- name, tag-slug and description. Please add an additional field that would allow us to specify additional metadata parameters when needed. To me, it seems most useful if this were a freeform field(s) where we could specify our own parameter strings.