(The right-shift-FAIL seems to be a bad habit of Asus and a few other Chinese/Taiwanese vendors; I suspect Lenovo still have some input from IBM.)
I have an Eee PC with the same style of keyboard as the X101 and I can't really think of anything negative about it. It's the best laptop keyboard I've ever used and I've reached speeds up to 130 wpm on it.
When you look at the whitespace (well, red-space) on the right side of the Lenovo then there is plenty room to fit a full-size Home/End/Pgup/Pgdn block.
But it would look a little odd. And I suppose Soccer-mom doesn't buy laptops that look odd for sake of fitting keys that she doesn't use. Soccer-moms apparently prefer glitter over usable keyboards...