Why in section Admin Score edit summaries used in the article space and edits to the article space count is same for all users?
Topic on Talk:XTools
Edit summaries are measured only in the mainspace because that's a strictly collaborative area. For instance you generally aren't expected to use edit summaries in your userspace.
Your second point sounds like a bug. This tool admittedly has not been given much attention. I'll try to look into it soon.