Yes, extending the campaign is rather simple. Making anything of signifigance happen after 1943 is a bit harder, which is where all this coding comes in.
I'm nearly ready to release the demo. The allied AI is all but finished with it's testing. Thing is, then I have to code the actual part which takes the memory variables and edits a prebuilt "empty" campaign file I will provide with the proper events. I'm betting that will take the majority of the time, but at least you'll have a demo to play with between now and then, complete with source code (I retain rights, of course.
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Watch this space!