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A beep would be nice. And the option of turning it off for those who don't like it, as well. Heck MINI already gives you the option of flashing the lights.
There's a phone app called Find My Car, or maybe Dude, Where's My Car?
I've used the Find My Car app. They're both only as good as the signal strength. If you're in the middle of a large indoor parking garage you're more apt to have issues. Been there. Done that.