That advanced/character/Slow Motion Animations slows down your animations so you can get a photo of them? I didn't (mind you I'm sure there are thousands of things I don't know).
I learned this little nugget in a workshop on the MURKU Comics HUD at Orange Island today. The HUD is free for now and it's really neat - if you want to play with something cool go try it. There's a Wiki if you want some help with the functionality.
Me? I'm going to play with slow motion a bit first. :)