CustomPageSize query

[ronaly]

DDK handles the creation of custompagesize by just adding like this example code:
   VariablePaperSize Yes
   MinSize 216 216
   MaxSize 612 1020

However, in a CustomPageSize query I need to add some code to make my printer works for a customized paper size.

Is there a way I can append additional code in the CustomPageSize query?
*CustomPageSize True: "pop pop pop <</PageSize[5 -2 roll]/ImagingBBox null>>setpagedevice"