Hi Erick,
Sorry for the delay in getting back to you.
We do have support for setting the page size and margin. I have created the sample in which page margin and size has been set and the sample is working fine here. Could you please take a look into the following sample and let me know if you experience any difficulties.
Here is a sample for your reference.
PageScalling.zip
Please let me know if you have any further queries.
Regards,
Prakash.