What else can I do with SpreadsheetML?
In addition to many Microsoft resources, you can get the XML Reference Schemas here for SpreadsheetML, WordprocessingML, and other document formats. This is the spec by which we decide if feature requests can be implemented, and the spec we use to implement those features. With that information you can augment the documents produced by NebulaXLite. Modification of XML is easily done in Pick BASIC, which is well suited to this sort of string manipulation. You could consider NebulaXLite as the first step in generating much more complex documents that suit your specific needs.