I've brought in the DLC content, unlocked the advanced start options, and provided a full list of cheats when accessing the Old iPad in the player's room. I also lightly edited a few things which bothered me.
Specifically, I've corrected the spelling of the "Strength" and "Intelligence" stats, added a hint for the sister's swimsuit quest to the quest log (Mall prosperity has to be at least 50), added a new cheat which activates all the other cheats at once, and slightly reworked the way accessing the DLC with a travelling partner works, and added the ability to invite Rae or Emily to the DLC Island (they each already had a scene but couldn't be invited for some reason). I also fixed the incorrect file type for the Eva scene Quickpawmaud mentioned above.
There are likely still bugs in here I didn't notice, and I may have accidentally broken something while modding it. Let me know if something doesn't work.
Mega