at least its hear for people to try / use if they want to...
there's been lots of mods / add-on's that people ask me for that i have thought are useless but still posted them.
not everyone shares the same opinion.
its the same kind of thing with overclocking i don't think there is any point in doing it, but i would still post it / include it in a rom
overclocking makes the cpu faster, hence making the phone run smoother and better, but at the cost of heat and battery consumption and life of parts (i upgrade my phone every year, so i do not care about shortening the life expectancy).
this feature adds on screen buttons
which are already a part of the phone, it basically adds a feature which is already there and at the cost of screen space.
i just think there won't be many people who use this feature, but it is there for anybody who will.
a bit like having 2 sets of pedals in a car in the drivers seat, so the driver now has 2 accelerators, 2 brakes and 2 clutches, just in case one of them fails or stops working, but he now has less leg room.