They are probably never going to completly trick it out, but it would seem fairly easy to add a few simple goodies to a "kalahari edition"

1. Have a 18 tire option with AT's at around 31 inches that fit under the car
2. Allow you to alter the suspension a bit from the car's menu system directly without our own mods (although, i am sure, they would be very wary of this for liability reasons). increased stock height, increase speed limit on raised suspension, perhaps have a second suspension setting, maybe even a slighly different suspension if stock is going to be higher
3. External Spare Tire carrier
The more elaborate (and unrealistic) options would be a larger fuel tank (although diesel would solve this), off road bumper and moving the exhaust ...
And, as David suggests, add 5k or so to the price, but little to the cost, and make a profit....
My best guess on why they don't do this....driving the Ruta Maya (one of their old videos) isn't where they want to market themselves nowadays....its having a car equally at home taking you on a shopping trip to Rodeo Drive or skiing in Aspen...not that there is anything wrong with it, but enthusiasts such as us are probably not their target audience anymore...and I would submit we haven't been for a while. As they seem to be doing fine in both sales, low inventory and profit, it seems to be working for them.