JavaFX 2.0 :: Dynamically Change CSS Class And Splash Screen Implementation

So it seems to reason that many JavaFX applications will want to dynamically change CSS styles.  Is the best way to do this via the <node>.getStyleClass().add("classname")?  The underlying data structure is an observable list.  So lets say one has 5 styles that simply change the fill color of a circle to 5 different colors respectively.  So if I have a condition in which I want to dynamically apply 1 of these 5 styles, the way I currently do this is by defining all 5 styles as strings in a list using a static initializer, then I call <node>.getStyleClass().removeAll(list), then getStyleClass().add("classname").  I do this to avoid adding the same style over and over and inflating the underlying list.  Is this the correct way to manage dynamic CSS styles?
 
So I know there is a few different way to implement a splash screen.  My app has definitely gotten larger over the last few months of development and I have noticed there is about a 5 second delay between when I run the application to when I see the main stage.  I was thinking a splash screen would be nice to fill this time period.  I have not had time to prototype using a Preloader and I fear that using an alternate, lightweight stage on startup would still take too long of a delay.  I was actually thinking that using the nice and simple JVM argument "-splash:<image name>" would be simple, easy and effective.  Unfortunately when I try to do this, the splash screen comes up but never goes away.