Other than the pathway option to have them move around, I believe to add further life and atmosphere into our homes it would be a fun idea to have all NPCs in a fixed pose or action with certain objects or each other, for example:

I have a notable home that I've themed to look like a lush and vibrant forest from Jame's Camreon's "Avatar" at night, with multiple glowing plans, trees, and light fixtures morphed into textures to add the illusion of glowing plants, grass, water, etc. To add to this, I put creatures like durzog pets on tree branches, the glowy looking deer fawns out on grass, and the star orphan elk up on a cliffside. They look great, but it would juuuust be a bit better if i could make the durzog stay laying down on the branch, the fawns grazing in the grass, and the star orphan elk grazing as well.

This would also be cool for houseguests i have in other homes, have them sit, chat with each other, maybe give them a personality we currently own, read a book, write a letter, etc.

(also, it would be pretty cool if we had the option to hide the saddles of mounts when they're in our home since we can't ride them there / they're there for display)