Actualy I'm also into this editing the Smart Codes thing and wondering how to do it.
I guess there are not much Rapid Starters around
Smart Codes have been replace with ID Generation Rules in 11.2. I've used the new format. What version are you on now? Did you get Smart Codes working?
I tried ID Generator and I hate it. You cannot use it from any of the CAD (SE, SW, Catia) but I'm not sure about NX12 so maybe that one works now? You also cannot Save As to a new number. We replaced it with custom code. It's not ready in my opinion. I had to create 1450 conditions and concatenation rules in the ID Generator to make mine work as requested. Not an fun task! Let me know if you try it and like it or not. I'm interested in why anyone would want to use it if you can't Save As.