Some of us like to simply drive and show our exxies. Chase has some good ideas as well but picking on power door/window locks and air bags as adding weight and cost seems a little funny to me. You can add the weight of that by sucking down one of your favorite brews. As for cost, who cares about cost? Owning an X means cost, right? Ha! Chase's approval with the sound system tells me he has his own priorities as well. And that's OK, we all do.
I'm not an ABS fan myself, I was/am throwing out ideas that would appeal to the average driver, not the average race car driver. (We don't all race, Chase!)

The stock brakes on an X perform poorly at times and everybody knows it.
I'm one who likes to add the specials, yeah, the stuff you find in luxury cars.
I notice others do this as well. Not because we need them. But because we enjoy them. The funniest thing Bertone/Fiat added to an X was air conditioning. Like we really need that! (maybe Mrs. Simpson didn't want her nice blue hair ruffled) But it's what people wanted.
Obviously a hybrid engine would mean less pep, but those batteries are not as heavy as the engine in the X. They can be engineered to fit nearly any space. Take the SmartCar (as example), they fit a hybrid package in that little space and if you've seen them run, those cars seem to fly down the highway. No, they're not breaking records off the 400 but that's not what they were designed to do. Likewise, the engine in the X wasn't made for burning rubber either. It's a challenge for a racers to give the car more pep. Thats part of the fun. But it's not all about go...
...some it is about Show.
Cheers!
Bob