Semi-coincidental. I had already translated it, and this thread prompted me to post on the wiki. One reason I hadn't before is that I've tested it only against the Mac version, and found a few differences with the original TeamX document. Some of the fields in the inventory item records are in different places. They also didn't mention the perks.
@ Per:
Thanks for catching the misplaced traits. I'm not sure the car location variable is correct, as it has never matched the actual map ID. It isn't the real cause of the 'disappearing car' bug anyway.
Each map the car can be on has a local variable saying if it's been created or not. Sometimes that gets set to true, but the car hasn't been made, and that's the bug. The game thinks the car exists, so it won't create it, and you can't use it to drive off the map, which would clear that variable. A fix is to hack the relevant .SAV file and clear it manually.