So thinking about Colonisation a bit more.
What feel is missing from the info we have so far is the actual management of a new system. I'm hoping that your actions set the economy/security levels, not just setting a couple of drop downs boxes.
It could be done as follows; -
If we assume that a new system will start off with a colony/anarchy status, the only way to get the security status and economy you want is to build the right combination of settlements.
For Security - You have to add military settlements to increase security. However, the more normal settlements you have, the more military settlements you need to keep order.
For Economy - If you want your system to have a certain type of economy, you need the right combination of settlements. For mining, you quite simply have lots of Mining settlements. However, you'll also need a number of Agricultural settlements to feed them, but it's not a one to one relationship (say one Agricultural settlement can feed 4 other settlements).
For more advanced Economy types, you have to more advanced combinations, i.e If you want a refinery system, you need at least a couple of refining settlements. However, in order to have those settlements available you have to have at least two mining settlements, so that would mean, you'd need 2 refinery settlements, 4 mining settlements, 2 agricultural settlements to feed them all, and lets say 2 military settlements to increase security to low security.
The idea being, if you want an advance economy and secure system, you have to spend time shaping your system before the BGS starts to influence it.