7D Single Point AF

Question from a thicko who has read the manual.
When selecting all 19 AF or zone AF points, no points are visable in the viewfinder until you press shutter half way and obtain focus, then black AF points which have obtained focus show up.
If only one AF point selected (via AF point selector/MF button) say centre point, this stays on as a black AF point. My question is there anyway this can be off and only come on when you press shutter half way down showing you have obtained focus, or do you have to enable the red illumination via C.Fn III-8 1 'enable'.
You can tell I am used to seeing the AF points and they light up red when focus is obtained.
I am missing something?

No, you've understood it perfectly.

With the older cameras, you always had to see all the AF points available, whether you liked that or not. The 7D has the C.Fn III-9 to let you choose.

With the older cameras, you had to either have the AF point(s) that acquired focus to light up or not (C.Fn III-4 on a 40D, not optional on a 400D). The 7D gives you the ability, through C.Fn III-8, to have it always, never or only in low light. The 7D also gives you the option to have the AF point acquiring focus only turn on as black in daylight, but that works only when using at least AF point with expansion.

If you have a registered AF point (Home Point in Canonish), that point will be visible as a small square beside your main focus point. When the main point acquires focus, the HP turns off. But when using the HP, the main point turns off already when you initiate focus search, so it's a bit confusing.

Apart from that, it's the green led at the bottom right of the viewfinder info panel or enable the camera's beep.

Finally, the 7D also allows you to continuously track which AF point has focus at the moment, when tracking something with AF servo and several points active. C.Fn III-10 handles this.