It has been a long time but I got an idea going through the forum today. I was thinking that since a player would get legendary equipement and use it constantly, what about shaking that up. What I mean is that for a mission that a person going to play, the game would display alongside the mission some equipment that would increase the amount of keys and scores one earns.
Here is an example. Let us say that there is a boss rush mission that have a bonus for keys and score using the vulcan chaingun and copper heatsink.
It is a lot to implement but it would make subtle change to how a person might play a mission instead of the usually high tier spaceship and equipment that is used in each and every mission.
Note: This is a concept and I need feedback to further improvements to this idea.Thank you.