Is it possible to create your own story, with everything that it entails? Like, in Age of Empires you can create your own scenarios. Would be cool if it was possible in Sims Stories On the case it said you could create your own stories so I was a bit bummed out when I realized they just meant free play... :P
Yes and no, you can not create the controller to run things like the story mode does but you can use any base game hood in LS you want to as long as the hood number is different than N001, N002 and N003.
You can remove those and replace them with the org hoods from the Sims 2 base game and they will work though.
You can put at least 3 more hoods in and they will go into rotation. (Maybe more but I have not went above 3 yet.)
There is a player made controller that when something happens in the story a pop-up comes up and a gift is given.
If you are great with SimPE you maybe able to figure out how to use it for any hood you want.