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Say I want to spawn an actor and give it the same velocity as an already existing actor. Is there a simple way to reference the velocity (and position) of another actor? Like actor1.yvelocity or something?

If you want give the same velocity of the creator, you can use the pointer returned by the CreateActor funcion:

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Actor *act = CreateActor("bullet", "icon", "no parent", "no path", 0, 0, false);
act->xvelocity = xvelocity; //velocity of new actor will be the same of the creator

Or, in the 'Create Actor' event of the bullet get the velocity in the creator variable:

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xvelocity = creator.xvelocity;