What make/models of printer do you utilise? You probably want a model specific PPD which will be more fully featured.
We use a fleet of HP MFP's in my shop and we deploy a PPD for the model we have more units of (an M775), and most folks seem satisfied with that. Your manufacturer may have a universal PPD available for download?
Found my solution.
I don't know how generic it is, but there are 2 ppd files readily available within every Macbook.
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Resources/Generic.ppd
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Resources/GenericPrinter.ppd
Generic.ppd has the basic setup, therefore no A3 paper option.
GenericPrinter.ppd has more options, and A3 is available.
Now that I changed this within my JAMF Pro printer settings, I can now select A3 paper to print.
Hopefully this information can be of help to someone :)