What exactly do you want to modify in that template?
I guess you would only be interested in the data that is generated in the document and for that you have the options to customize the data and the format in which it is displayed by using the Document Generator tool.
Why fix when it ain't broke!
The fix will definitely break.
Personally I recommend an ODBC capable report writer and learning where what is in the actual tables. I have not been satisfied at all with the results I get from the canned reports. I also change to the grid view, select my columns and save as an Excel file so I can get what I need.