Uh... private variables are gonna multiply like crazy. It is best if we leave them under respective objects they belong to.
Anyway, for behaviors, it'd be nice to see which objects have each behavior type, in case I missed one or want to change some behavior settings across the board. Basically, when you add a [Bullet] behavior, you'd get a Bullet folder under Behaviors folder, when you open it, it lists the objects with said behavior.