lots of repeats, but the more people ask for them the better, right? also, i don't know if any of these have been added with expansions--i only own SPs. so please do let me know! and maybe some of these are too specific... but anyway:
-drums, saxophone, trumpet, trombone, bass, clarinet. i just need to form a jazz band.
-sitting cross-legged. (can they even sit on the floor/grass/wherever?)
-slow dancing, and actually dancing with Sims in a way that makes sense. usually they don't even look at each other, it's just the same as dancing on their own.
-curling up in bed when sad. different to "cry it out" as they are under the covers when they do that.
-this would be difficult, but: crying on another Sim's shoulder/in their arms.
-walking while holding hands.
-being able to touch foreheads with another Sim. like a tender/romantic interaction. brushing their lips together, different to the kiss we have now.
-hum along to a song when they listen to the radio. they can't do this, can they?
-ask another Sim about their favourite music.
-fears, phobias.
-a white cane. i need a blind Sim!
-casts, bandages, burns, wounds in CAS.
-laptops, but i don't know if they have been added with expansions.
-gift-giving.
-a way to keep the flower they can give as a romantic interaction.
-more options for wrinkles.
-adult Sims reading and discussing books together.
-making tea/coffee for another Sim.
-winking.
-holding hands across a table.
-ask a Sim to play a song.
-browsing the web together.
-more moods.
-sewing machines.
-more walking styles.
-floor fans.
-more animations for clumsy Sims.
(i have way too many more to list, i need to stop now!)