Display Tag Export

Hi,
I have a question on Display Tag export function.

Currently I have a JSP that shows a collection of data using display:table tag.
Now, we have a new requirement that user should be able to export the data in an PDF, EXCELL format.
display:export can be used used for this.

Problem is:
1. The Report exported should also contain header information like UserName, timestamp which is not shown in JSP report.

Solution I thought of was using the nested tables. Have a one table say table1 with two inner tables table2 and table3.
table2 has header information, which I can hide while showing in JSP (I am guessing display tag will consider this table even it is hidden. I am not sure abt this).
table3 will have my listing.

Problem with this approach is I am not sure how can I render table with in a table using display:table. Sample code will be greatly appreciated.

2. The requirement is to show the export options (EXCEL/PDF) as a radio button, but not as a hyperlink. Any Ideas how to approach this.

If you can think any other solution to this Please let me know. I would really appreciate it

thank you
Saritha