Steve,
Some kind of ranging reticle... It's pretty hard to beat the Burris Ballistic Plex. Maybe a good Mil-Dot setup with a focal plane setup where the dot sizes don't change with power changes?
Target turrets with easy zero capability (no allen wrench required)
He's gonna need some SERIOUS ability to adjust the reticle. The Burris is woefully inadequate here and the Leupold is very good. Handguns don't make the velocity of rifles and therefore have way more bullet drop. This is the most important issue.
30mm tube
40mm objective
It CAN'T be very long or people will be resistant to buying it and it'll look aweful... If possible it should be as short as the Burris 3-12x or close to it.
Make it in matte blue only... Nickel doesn't re-sell well.
Of course an adjustable objective with side focus would be nice. This is even more important with a pistol than a rifle!
Phase coated lenses or at least as good as the Bushnell Rainguard coating.
And with all that he needs to be very sure it's reasonably easy to center your eye behind it. That's the big failing of the Burris. It doesn't have to be that hard. The Leupold and Bushnell are much easier to use in the field than the Burris.
Of course the harder it is to center your eye behind it the less parallex you'll encounter so there is a tradeoff there.
Lighted reticle would be nice but I'm not sure it'd be applicable in a long range high powered scope like this.
I'd like to see 6.5x-20x power range if possible with generous/constant eye relief. That's the biggest turnoff for me with the Burris. I have long arms and absolutely hate the short eye relief at 12x! I have to get all scrunched up to use it...
If he accomplishes all the above nit-picky stuff I've mentioned then he'll have what is IMO the perfect long range pistol scope and it'll easily be worth $1200!!!
$bob$