You can do a few things in the .ini files. I've adjusted my game to 852 x 480 & windowed resolution so I can do other things while it loads levels. There is a levels config file which might be neat to edit, however it seems none of the changes I make really take effect, and I have that problem with some other files too.
I'm not too sure. But the biggest help was probably the control fix one, that worked and its a lot easier to play.
The files are kinda a mystery, but here are two things that may be of interest?http://www.mediafire.com/?flqrcosyn52l7dd
Warehouse Model? I extracted this package and it includes what seems to be meshs/textures for level. But my understanding and ability is kinda limited. Some Borderlands 3 site has some info on the sound files and provided me with some small info but that's about all I know. If someone wants to confirm this is a "model" of the level or not then let me know.http://www.mediafire.com/?7dqj5blll540tg8
Numpad control assignment, drop in THHDGame/Config