Custom Renderer possible for Table Headers & sPdfMessage ?

Hello,
Thanks a lot for the amazing plugin. I have a question regarding the Custom Renderer. Right now , I am able to use the "fnCellRender" option to render the customized td details. Is there any possibility to have a similar functionality for Table headers as well i.e to be able to override a function when a Table Header is being rendered ? and similarly for the sPdfMessage ? My Requirement for the sPdfMessage overriding is that I want to include the text that are being inputted and filtered in Datatables as the Title to the generated report after filtering.

Thanks a lot!