I can't believe this thread has been around this long without a bunch of useless comments about how seat memory is for weak people who don't deserve to drive a 4runner. You should be happy to have adjustable seats at all.. back in my day we had to unbolt the seats and weld in new attachment points every time the wife wanted to drive..
But Yeah, I'd be curious about this as well, if it was an easy mod. It probably requires a whole wire harness and a different body control module and an act of congress....