Here is some ideas that would Improve the game for me.

I would like if we could have garages and cars like in the sims 3 even if they only function as a moveable decoration. It would be nice if we could have more animal related things like wall mounted watering and feeding stations for horses, smaller or a way to designate an area specifically for a stall without taking up as much space so I don't have to make huge barns in order to have a lot of horses. New fence and gate designs for horse stalls would look nice too. Instead of building your house and playing it immediately it would be interesting if like the Tree house in game you had to build it from the ground up room by room, and furniture and decorations have to be unpacked and manually moved by your sim into place. It would also be interesting if your sim could have a carpenter, Electrician, building contractor professions you could go to different lots to build too. It would even be nice if paint and wall looks could be separated from crown and trim moldings so they would have to be painted and put on separately. It would also be nice if there were bailers and forklifts that you could make your own hay bails and move them to specific areas to store to feed your animals later. I also think it would be interesting if each type of area had wildlife that caused positive and negative effects on either your sims or lots. ex: you have the racoon trash raider or the fox bandits. I would like to see a moose that if it doesn't take notice gives a positive mood let, but if it notices you your sim has to make a run for it. It would also be nice if the household limits were larger and pets and animals didn't affect it at all. Ex: instead of a limit of 8 sims per household 8 sims in a household per generation. so if your sim has two or three children which age up to adults and your sims are grandparents those three sims can each have a total of eight children on the lot together at a time. It would also be neat if you could hold a family reunion where anyone who is a relative even distant shows up even if it overloads the house limit since its only temporary.