9" width via Manual try w/M5200n - NOT!

The multipurpose feeder accepts print media within the following dimensions:

• Width—69.85 mm (2.75 in.) to 229 mm (9.01 in.)
• Length—127 mm (5 in.) to 355.6 mm (14 in.)

One would _typically_ create a new Form (Properties->User Customize->New Size), however the dialog will not allow anything greater than 8.5. My stock is truly 9" wide. How an I use 9" wide stock, as the specs indicate is possible?