I can see how that could be useful but i hope Inventor never becomes like Autocad in the sense of PC3 files. The printing workflow is jsut so much cleaner in the occasions when random paper sizes are required.
What type printer are you printing to? Sounds like it may not be sending the proper size to the proper tray.
Also, also what paper size/drawing size are you sending to the printer?
My printer is a RICOH Aficio MP C4000 RPCS. I have tried printing on a 8.5x11 and a 11/x17 paper.
I dont have any problem at all printing from Inventor or any other application on these sheet sizes.
Running Windows 7x64.