External Reports in Dashboards (XML) - Manipulate Titles

[#1]

I would like for the ability to manipulate the reportlet title and chart titles using XML (or any other method). Currently, the pie chart shows the first metric as the title (this may be a bug?) and there is no way to manipulate it via the XML scheme.

[#2]

I also am doing similar task, feeding back to the dashboard with xml. I wonder  if there are undocumented features such as showing values in percent or decimal instead of integer.

Documentation isn't easy to find, if any.