6. Free Roaming
Rockstar does free roaming better than anyone. They build maps that you want to explore and every bit of shaded area you uncover, there are hidden gems to get excited about. And applying that to Star Trek, a franchise that had exploration at its core; imagine the chance to properly explore the whole Alpha Quadrant. Travelling from planet to planet, picking up missions and exploring strange new worlds. Hijacking cars is a staple in GTA but Jumping from starship to starship is not going to be an option, but anyone who plays a Star Trek game, having only one ship to control is not a problem. Rockstar introduced cars that each character owns in GTA and you feel really attached to them. If Trevor is not driving his truck, it seems odd. That same attachment could be easily transferred to a starship. Maybe you could customise it, pick what class of ship it is and really make it your own.