Without expanding the footprint of the land, I could see them squeezing up to 4 small things in without too much effort
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1. Easiest, just probably adding some netting to slinky
2. Destroys the current meet and great space
3. Some interesting pathing to get under and in the middle of Slinky, see emotional whirlwind at DCA. Also would have to make some room in here for slinky overflow Quene.
4. Altering the exit path of TSM could free up just enough land for something small. Personally I would also connect this path the Stage Ln so there is actually an alley of Toy Story land to explore.
If It was me: 1 would be Al's Toy Barn. 2 Jessie's critter carousel 3. Toy Solider parachute drop and Slinky extended Quene. 4 would be new meet and greet spot and a few snack/merch locations.