First, take a look at this thread about dramatica and interactive fiction.
Second, you should probably try to understand Dramatica a bit more before trying to write interactive fiction with it. It’s complicated enough as it is, but adding interactivity changes the complexity exponentially.
Third, @actingpower 's question 1 is a good one. Even if you work with just one storyform, several things allow for some variation, e.g. cost & dividends, relationships, etc.