Yeah, it needs a pause because the scene needs to be loaded before saving it - Doesn't necessarily have to be 500ms. There are a few action parts that won't be executed if you try adding them inside of an at begin of scene action block without a small pause at the beginning of the action block - but I can't remember what they are off the top of my head - in general it's best to pause for at least the amount of time it takes to fade into the scene which by default is about 600ms.
