Not a bad idea, would enhance the single player feature a bit,
but creating such a story mode is up to the users, as there are bigger prioritys in badspots agenda.
Also, there are a few problems for creating such a mode, that have to be taken care of first,
for example, creating the story elements, what happens? What do you have to do? etc.
And then comes the control of bots, so they act like different characters.... and so on,
this would really take up some time.