Hello,
Regarding you question for Level Streaming, take a look at the Content Examples - there’s a map dedicated to level streaming called Level_Streaming that explains a lot of the concepts.
Regarding your question on scaling the player, there is a tutorial on the wiki that will show you how to do this by picking up a power-up:
And regarding your question about the timeline, the key press W is different than the MoveForward event as MoveForward gets called once per frame and is looking for the Axis Value. For what you are trying to accomplish, there has been a couple posts on it for creating a “Head Bob”, take a look here:
-Wes