Per the title, I've been looking for it thinking that maybe I could edit it manually and set permissions so that the game can read but not change it in order to get a work around for the key mappings not being saved between sessions. I installed the game to my Applications folder, and right clicked on the icon in finder, selected "Show package contents" and dug around in there. I opened every .plist file I could find but didn't see anything resembling a keymap. I also looked in my home folder and the ~/.library folder (as they are analogous to the my documents folder where the files are stored in windows) but didn't see anything promising. I'll keep digging but was curious if anyone had found this or is even looking.