So I've played few custom maps and here's some thoughts.
Ship operational range. I played a large map and all my ships could reach almost to the edge of it without any life support systems. So I could just fly around enemy systems freely and the enemy could do the same. I wonder if there was some way to mod this so that ships without life support modules could only operate inside your own zone. And colony modules would increase the operational range to make colonizing distant worlds possible, but they would take much more ship space.
Then, I had rly big issues with losing the focus about my survey ships all the time. There is this big list of fleets which all have similar names, the map is symmetrical and the ships all look the same. So I constantly kep looking where my survey ships were. I couldn't rename them, because i kept them in fleets and the fleet name changed every time a new ship was invited. And because the fleet might sometimes perform its last moves on its own and ships were colored like my influence zone on the minimap, it was pretty difficult indeed to keep a constant focus on specific fleets.
Commonwealths are a bit silly. When you take a planet, you might make it into a commonwealth. Beginner commonwealths have 3000 money and they will give it to you straight away, for free. After that they have normal trading prices, which are often very unreasonable. For example my commonwealth offered me 100 money for a colony. But when I wanted to buy one colony ship from them, it costed I think something like 9000 money. Anyway, this means that it's pretty easy money to take a colony from enemy, make it instantly a commonwealth, rob their money and leave it like that. It's just after taking 6 planets, you have 6 commonwealths that are just annoying and you hope they are destroyed.
Otherwise, it's pretty immersive game. Any tips how to mod that ship range issue?