Well, I managed to get a change in the DefaultEngine.ini to affect the game. I was trying to get rid of the closeups on packs of enemies when you first make contact, and tried commenting out what I thought might be the lines which cause that, along with the startup screens for Firaxis, 2k games, etc. Commenting alone didn't do anything, so I tried replacing the + on the start of the line with a -, and just like that, the startup screens no longer show up. The enemy zoom-in still happens, so I'm working on that, but hey it's a start.