That option doesn't exist for me (see below):
For reference, I'm on the PADS ES suite running Layout (and Router, and xDX Designer) VX.1.2
EDIT: I tried adding the "Design Rules" button to my toolbar using the "Customize" menu, but after placing it, it's greyed out and I can't open it. I'm guessing it's because rules are handled through the "Constraint Manager" now, but I have no idea...
Under the Constraint Manager, I see some via rules (none of which seem to preclude the use of a via with the above dimensions), but the same thing happens within the constraint manager as Layout itself - when I select "ROUTING" as the default via type and press apply, it defaults back to STANDARDVIA.
If I look at the "Via Spans..." menu option, I can change the default via type to ROUTING, but to no effect.