I'm used to programs like Stencyl and AppCraft in which you can apply a rule or behavior to the entire scene, but in Gamesalad I only see a way to create rules for actors and tables. Am I missing something?
Yep its exactly as everyone said above. Basically you make a dummy actor and place your rules in that dummy. So for instance if you want to set the character's ammo to 10 on start, you can place it in the dummy actor. Put as many rules as you want in there and make sure the dummy actor is the very bottom on the layer list. Why? Because the system reads from bottom layer up.
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What I do is have an actor called "scene controller" chuck it into the scene, and then do any scene type stuff in that actor.