Reduce or eliminate the penalties for declining Agent missions.
When I started doing missions, I did not realize there was a distinction between "Declining" a mission, and closing the mission offer window using the "X" button. If you decline a mission, even from a Level 1 Agent, it locks you out for days.
A related enhancement would be also be for the Agent to tell you how long they'll be mad at you for, after you decline. They currently just turn their nose up at you.
As a new player doing missions, it's easy to forget mission items that you are granted, and which are required.
The "Agent Missions" UI is a great tool. A step could be added to it (eg., "Load item X into your cargo bay")