My ideas for base game improvements:
1. Making all NPC roles (librarian, firefighter, principal, busker, weirdo, etc) active and/or rabbit hole careers for our sims so we have more options for making money and storytelling
2. Making all vacation worlds residential
3. Adding swimmable areas and harvestables to all worlds
4. Adding option to make travel between neighborhoods cost $ and between worlds cost $$$
5. Ability to combine lot types (residential and retail, park and museum, etc)