Sue,
If I understand your question correctly, you are asking if during the Try it section, can you configure the simulation so that the users can click on the four drop-down lists in the trigger wizard in any order.
Since the Try It steps are based off the Show Me steps, I would so no. It might be possible to modify the Try it steps to allow this but it would require a lot of work to make it happen and possibly some additional recordings but then you are caught up in "how many different ways could the user perform these selected steps".
I agree that being able to simulate the "real-world" would be great in some situations though.
From my many years in the classroom, I've found that showing students multiple ways to navigate an interface seemed to only confuse them. On the other hand, showing them one way to do it always helped them learn faster.
Once they become more comfortable with the app, only then I would show them more ways to accomplish the tasks or an easier way to accomplish the task. Make sense?