I am enjoying watching the civilian economy expand, and would encourage you to take this further.
Hotel / resorts. Colonies with small populations that luxury cruisers can use as destinations. Perhaps they have a low infrastructure demand to represent expansion.
Civilian colonies. Not related to mineral wealth, but perhaps there is someother, non gameplay related, reason for being there. This might be as simple as setting up a new community (perhaps similar to the founding of the US), to jails, a non TN resource etc. These could expand to become quite large, and include large civilian economic supplies and demands.
Perhaps the civilian colonies should be able to produce civilian terraformers? I dont suppose they will produce them in numbers, or locations, to unbalance the game. But I dont know what balance would be in this game. I suppose I mean to replace the work the player would do anyway.
I am not familiar with the Starstorm background, but there are plenty of other modern references in which 'The Company' has outposts or facilities in which the storey is set.
I like the civilian economy as it represents the rest of my civilisation getting on with dealing with becoming star based, while I deal with the military side. Expanding it would add to this immersion, and add additional colonies that would need protection and policing.
Perhaps this is not for v5.0, but this seems the best thread.