if this is mentioned elsewhere then please inform me.
i think the interior designer has potential, the alteration I’m thinking of is the possibility to add walls or partitions to make designs more dynamic for example a half wall could be made in a restaurant behind the restaurant booths or simply to divide up the space that’s my idea.
I’d love to see a lot more variation in wall and floor colour available too. Maybe even carpets for the offices, or more upmarket premises? The very limited stuff available at the moment is very bland and too repetitive in game - and it rarely satisfies the customers 
In EA 0.3, the first couple partitions are in the game along with more floor/wall designs and lots more decoration in general. And more will continue to come!