Front-break shoulder rig?
http://www.fist-inc.com/holsters/holster/70.htm
They seem to have the Kahrs as model guns, I'm guessing it's similar to the Galco setup.
Another interesting rig (my current prefence) is this thing:
http://www.klnullholsters.com/NewHolsters/smz.htm
If somebody tries to draw it from behind, proper retention technique is to laugh maniacally and call 911. They will arrive long before the gun is removed. From in front, an arm across the upper chest locks it in place tightly - but just twisting the wrist to snatch the gun away would be difficult in itself. Not a problem for the wearer, though.
I've got no objection to cross-draw - I'd probably use it if:
1) Texas allowed open carry.
2) I could get used to belt carry. I don't like belt carry from a comfort perspective - yes, I've got a good belt. And the belt by itself is pesky to me.
It's my opinion that, unless you use multiple holsters for various parts of your day, you ought to carry in a manner most conducive to a reasonably fast draw in the situations you are most often in. The greater draw speed gained in a strong-side holster means nothing if you have to fight your chair to draw, and you are constantly in your chair throughout the day. Crossdraw would probably work better more of the time in that situation.
How do you spend most of your time when you are carrying? Standing or sitting? Depends on your job and the times that you carry - maybe you can't carry on the job, or maybe you're required to.
Make your own decisions based on your own situation - just make that decision for a reason besides "Mannix did it."
Gunwriters - even the best - are speaking from their perspective, not necessarily yours. I don't know how many of 'em slam shoulder rigs in general, those with skinny straps in particular, and especially the skinny-strap models carrying a full-sized gun. And I hear people on this forum and others commenting on how painful they can be. I don't deny their experience - their experience jest ain't mine.