Workflow route: How to assign default route?

Basically, there is a workflow where at one task (after completed) the user has to choose between 3 different routes in a list. What I would like to do is have one particular route as the default (radio button is always on this route unless user specifies otherwise). The other 2 routes are optional (used less frequently).

It looks like Windchill's default is to select the first radio button.

Is there a way, in the workflow, to set the default (radio button) to that one specific route?