Glad it's working for you!

I note jenpen's comment... No, actually, it shouldn't be a global requirement or setting to force a selection for radiobuttons or dropdowns. There are plenty of situations where it is fine for some attributes to remain unselected while others must be selected, and only a per-attribute admin setting could force that. And this wouldn't even cover setting a default message or box/label text the way the ZC method does.
It is also possible to hide the "default" attribute so that it doesn't clutter the page, using CSS on attribute ids, if desired.