I've been working on it, but there's a few things the game won't let me do.
Hazardous anomalies, for example. What I'd like are anomalies that inflict a debuff of some sort that can only be removed by completing a side mission.
I'd like to be able to introduce alien animals that you have to monitor for a period of time while they go through a series of behaviours. You could assign away team members to do this by having them stand near the animals while the rest of the team continues on. These animals might be hostile, so straying too close might lead to attack.
I'd like to have the possibility of NPCs that you can talk to who might become hostile depending on how the conversation goes.