It does not appear to be a documented feature and a quick skim of the modules source and I can't see anything to suggest such a capability.
You have raised an interesting issue that may slow my own adoption of PDF::Table. It looks like you will need to contact the authors and see if the functionality could be added. The code does not look particularly complicated so if they don't add it by the time I need it I will do it myself, unfortunately I have no need at the moment and more urgent matters need my attention so it won't be anytime soon.