Yea you could program that type of game using a different program or learning how to program from scratch, but Gamesalad doesn't have that ability yet, too many rules and attributes, it just wouldn't work
You may want to start with a programming with Objective-C (using Xcode) book or two if you are new to programming. Also, there are lots of online tutorials to be found, so Google search is your friend.
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(should have tacked on my associate program URL but I didn't have it handy ;-) )