My idea for Astroneer is to add more traveling tools, such as grapple hooks, oxygen tanks, and possibly jetpacks. These items would work in many ways, and would make traversing through uneven terrain less tedious, as well as making the game easier and letting you accomplish more without wasting time using tethers or building.
Idea 1: Grapple Hook
Fires a limited distance
Two modes, Reel and Swing
Can be used to pick up dropped items
Reel and Swing are switched with a hotkey
Idea 2: Jetpacks
If spacewalking were ever implemented along with space stations, jetpacks would probably be a necessity when you are doing repairs.
Works in zero-G
Runs on Hydrazine
Also has two modes; Directional and Hover
Directional would allow you to fly in the direction you chose faster, and Hover would just let you fly vertically by holding down a hotkey.
Idea 3: Oxygen Tanks
Crafted quite expensively, but refillable by mining Oxygen or by using Tethers.
Carries quite more oxygen than the base player normally holds.
Reduces movement speed slightly