ABS programing and body modules are example of things that use the same computer, so its more than simply an engine thing. And given that all Chrysler code is proprietary and locked down, they pretty much have to reverse engineer everything. Look how long it took diablo to fix the WK2 ABS warning light.
Gear swaps for the metric gears, forget it. Its not new to the WK2, WK owners have been trying to get a gear vendor to make up some for years, never going to happen.
2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6, 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac