> I don't know how many subplots there are within the game but it must be a
> finite number, so I wonder if there is any way to add extra stories, and if
> so what critiria would be used in them (ie if you respond in X way then Y
> will happen). How easy or otherwise would it be to add extra stories when
> players have 'done' most of the current ones?
Around 500 (depending on how you count).
The biggest limitation is that it's not possible to add more than a
small number of stories and keep compatibility with saved games.