Would be nice to see the following
Pillars - Pillars with grooving or possible curves aside from solid cylinders.
Misc - Fences - multiple types wood and metal.
Gates - Wooden Gates, Metal Gates, mutliple sizes of these gates would be good so maybe one could be a house entrance.
Bridge Building - Ability to build a suspended bridge by look not by physics
Green House - Ability to build a greenhouse style structure
Jewlery - Once there is an armor/customization/clothing system it would be cool to have jewlery as well
Tools - Panning/Seives,
Lighitng - More torch options and lighting options
Weapons - Cannons/Gunpowder/
Animals - Have a companion animal that stays near you unless you tell it to stay and protects you if things are hostile that are near you, you could interact act and tell it to remain at home or bring it with you to hunt
- Gameplay for skinning and harvesting which I believe is in the works.
Farming - Chance to farm different fruits or vegetables and possibly have biome impacts and require sunlight and possibly water to grow
Mining - Gems and various ores for materials and jewlery
Lockable doors/Chests - To keep those nastys out!!!
I will edit to add more later!