Oh dear!
The 4X4 (or more acurately AWD) gives power to all 4 wheels to aid traction. For example a 100HP engine on a RWD or FWD car will deliver 50HP to each of the 2 driven wheels - if 1 loses traction, it gets all 100HP and the one with grip gets none. Whereas a 100HP engine on an AWD car will deliver 25HP to each of the wheels - meaning that combined you get the same power - but you have twice the grip with less likelyhood of wheels slipping. If a wheel does slip, the power is still then delivered to 2 wheels each getting 50HP. Its not quite like that as the IRD gearing and VCU slip in the F1 will bias power to the front wheels until things start slipping, but - that's the basics - at least as I see it.
Hill Decent Control (HDC) is an electronic system that tries to stop the car travelling faster than (IIRC) 5MPH down hill a hill. You point the car at a hill in 1st (or reverse) gear, take your feet off the peddles and the HDC will use the ABS modulator to apply brakes to keep the speed down as necessary. It all works very well, until it doesn't, and then you are in s**t creek.
So if you remove your props, you will have a FWD car, and as you have an automatic you will still have HDC - you probably wouldn't in a manual because the wiring will have come away from the switch.
I haven't spent much time in Bahrain - but from what I remember there aren't to many hills so probably not of much benefit anyway.