🚀 go-pugleaf

I'd like to add a custom, named, page-size to my PS Printer Driver.  It will be used to print from MS Office apps to PS -- and thru to Acrobat Distiller (so would I need to be able to edit Distiller's page settings as well, or is it the same driver -- I'm a bit confused on that one?). 

Someone in another forum suggested making a copy of the PPD and editing it to declare my new page type.  Does anyone have any info where I can find details on how to do such a thing and/or additional tips to help me do what I'm trying to accomplish? 

I've tried changing the printer driver's PageLength and PageWidth on the fly (using the DEVMODE struct), but apparently Adobe is keeping those values separate, as they're not stored where one would expect them to be. 

Thanks in advance! 
--AJ