Can I clean up my slide due to my timeline being full of different bits of content?

@Ashley: Yes as I mentioned in my discussion above, I am using the eye elements, but it takes forever each time to hide them whilst working on the slide and un-hide every element when I want to preview it. And when I do play it in SL, then it also takes a very long time to view it, so I just  use the preview option instead. And this isn't just for this particular slide, but most slides in general as I have to work with very content-heavy and multi-layered projects.

@Brett: Yes that is one thing that I am also wondering about and one of the elements from Flash that I sorely miss. It would just speed up the production process so much more. :)