Concept for Menu arrangement

[Andrew Prior]

If I add three pages under Home, say a, b, c
then they show up in the default menu as

Home
a
b
c

It is trivial to reverse this within a menu template so they show up as

Home
c
b
a

How would I arrange this menu if I wanted to keep a couple of key items at the top of the list regardless of other pages I added? That is:
the latest pages always appear, by default, at the top of the menu except that page a and b will precede them. Obviously I can do this manually, but I'm sure someone has done it programatically in their template!
I'm looking for this:

Home
a
b
h
g
f
e
d
c