Thanks for any help you can provide.

I have read the modding guide and attempted to use the search feature on this site for a previous post that may be asking the same thing. I want to make the game more about exploration and trade instead of combat. My plan to do this is to raise the cost of ship maintenance dramatically and reduce the range ships can travel. The goal is to make galaxy spanning fleets impossible, requiring influence to be the primary weapon for expansion. Limiting range should slow down expansion and make trade more valuable. 

I am unable to find the Def. files that control these two aspects of the game. I would also like to hear any suggestions on optimal numbers to start with. 

Thank you for your time.