Hi Mark (and others),
I've given so many introductions to Colour DIS over the last few days and it seems that I forgot to mention the mirror feature to you. Oops!
As you've noticed, the passenger side mirror dips down when you engage reverse such that you can see the kerb. However, this only happens if the mirror control knob (by the electric window switches on the driver's door) is set to the passenger side. So, if you wish to reverse out of your drive or are reversing in an open space, simply keep the mirror control knob in the straight position. If you wish the mirror to dip (when parallel parking, for instance), set the control knob to the passenger side.
If you don't like this feature and wish to disable it completely, you'll find it in the settings menu.
As DJ190 mention, the cruise control feature you describe is standard, whether you have Colour DIS or not. The only way in which Colour DIS enhances cruise control is that it displays the set cruising speed.
I'm delighted that you're so pleased with the upgrade.
Cheers,
Tom