I'd love multi functional lots, like we had in previous series. Running a business at home was great, and I also miss the TS2 feature of simply making money per hour you managed to keep a visitor on your lot (a ticket machine, kind of).
In TS4 I have several shopping malls, with multiple retail shops, but I always end up with the coffee shop category to have some NPC actually serving the coffee bar. I wish we could define sections of a lot with different lot categories/tags, or that each community lot object that needs to me maintained, would provide its service regardless of the lot category. The coffe bar object should attract the barista even if the lot's main category is retail.