Well, "Attack" isn't something that's necessary for movement, which is what the behaviors basically do. You can create a completely new control for "Attack" and set it to whatever key you like, and call on that control by it's name with events... just as I did in lesson 5 with the "Action" control.
As for renaming the "Move Left" and "Move Right" keys... well, as long as you're still using the arrows for movement, that's fine because the Platform behavior is defaulting to the arrow keys for "Move Left" and "Move Right."
However, if you change the Move Left and Move Right keys to A and D, for example, then rename the controls "Go Left" and "Go Right," for example, then A and D won't work to control the platform movement. Since the controls have been renamed, the Platform behavior reverts to the original "Move Left" and "Move Right" controls, which are the arrow keys.
So you can change the name of the of the control, or you can change the key for the control, but not both.