When sending a search result to the live screen during a service, the result will always appear on the default theme if none was specified. I consistently choose a default theme that is suitable for Bible references, since impromptu Scripture quotes are quite common. On the rare occasions when an unscheduled song is requested, it appears on the default Scripture theme, which is unfit for lyrics.
Could separate defaults be specifiable for Bibles and songs? Alternatively, the ability to set themes per Bible--of which I only have a few versions--would eliminate the need for this feature. (Setting themes for all songs is simply too daunting of a task, unless someone knows a way to apply a theme setting to all songs at once, either through the interface or via the command line.)