Add ability to set the default domain

Is there a feature request anywhere to allow setting the default domain much like you can with the free domain mapping plug-in over at WordPress.org? I just switched to the MUDev plug-in and I like it because it seems more stable, but it would be ideal to be able to set the default domain when several are mapped. For example the root domain and http://www.domain.com.

Is it possible now and I don't see the option? Or is this something that could be added as a feature request?