These parts are missing in my opinion:
- Ramp Quarter inverted
- Ramp Tringle
- Ramp Triangle inverted
- stairway Quarter inverted
- stairway Triangle
- stairway Triangle inverted
- Walls ; both sides inside (all types)
- Walls ; both sides outside (all types)
I wish these parts:
- Triangle parts with basic shape of the quarter (+ walls, floors, ceilings and roof) will probably never come.
- Gates in 2x2 format
- window parts
- half-high walls (like at Ark)
- half-rising roofs (as in Ark)
- half-height stairs
You could also say, I wish for more opportunities.