In order to detect the large supported paper size, you'll have to use the webapi /rws/service/scanner/capability to get the capability of the device. You will find the originalSizeList that list all the paper size of the device. Then you'll want to compare the size in the list to determine the large supported paper size.
Known:
When setting user permissions it matters if you have an A4 model or larger.
Reference: /doc/en/javaapi/101-63-0100.htm
The definition of "large" and "small" varies depending on models (the maximum output size of a device is "large" size). So setting large permission is not the same on all devices.
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