First of all I love the game. I wanted a "Abandoned on an Alien world" game like this for so long. Things I would like to see in the future:

Better research so that most of your Factory isn't devoted to it and more Items so making complex machines is what your factory is doing most of the time ...

I would love a Jumppack. Even without full flight it would make running around easier.

As would be nice:
for Trains: a Liquid Tranport Car (say 2.5k of any Liquid), A flat Transport Car for Vehcles, A Turret car for defense.
Combat Patroling robots

I would like to see more varity in Vehicles
such as:

Bulldozer- to smash down forests to to create paths
Helicopter or Aircar: flight travel
Car: with better speed control
Armored vehicle - Tank or APC with Mounted weapons
Patrol and Transport boats
Excavator- in order to expand lakes or make ...