Hi Marlon,
As far as I know there is no way to do that currently but it is a good suggestion and I have been asked that before. What some clients have asked as well is that they would prefer a way to default to "Yes" or "No" or "blank", where "blank" is not a valid response. The reason they want the ability to default to an invalid condition is so that the user would be forced to respond directly to that field when actually inputting data.
In my experience thus far, most companies want the default as "Yes", a few want "No" and a few want the user to pay special attention to that field for in their cases, though most lines will need to be "Yes", many should be "No" and they would prefer to have the user make a specific decision rather that ignore and accept a default.
Pete