Hi Mark,
Thank you very much for using syncfusion products.
Currently we don't have support for providing maximum no rows or columns through properties or methods as this is known. We don't have any immediate plan to implement this feature. We will get back to you once the feature has been implemented in any of our upcoming releases. I have placed the link below which provides more detailed information about the query posted.
http://office.microsoft.com/en-us/excel/HA100778231033.aspx.Please let us know if you any clarifications.
Thanks,
Jawahar.