Provide more features and mechanics that allow for Crewmember Roles
I want to see a PULSAR or Artemis: Ship Bridge Simulator situation commonplace in Space Engineers gameplay. I think this should be good for PvP, Exploration, Roleplay, anything you can think of. Some of this is possible already as different crewmembers can fly the ship itself, pilot drones or control turning certain blocks on and off...but...we want everything possible from Captains( Text and VOIP mechanics for giving commands, splash commands to specific players, etc), Weapons Specialist(Operating Turrets and other weapons, deploying explosives, loading weapon racks) Science Officers (Scanning, Researching, Collecting) and whatever else seems fun like Medics, Marines (Suits that matter for the job at hand anyone?).
All of the above can and should be supplemented by other features we all want to see and Marek has mentioned before in the blog of intending to work on anyway.