What Phil said, plus that a 0/2 doesn't make a lot of sense in practice. A 2 degree side bevel will not grip nearly as well as a 3 degree (or greater) side bevel. So it doesn't make a lot of sense to have a zero degree base bevel (which will cause your skis to hook up with the slightest amount of tipping) but then not have the side angles to allow a good hold once you are hooked up.
<Edit> As Epic pointed out, I forgot to do the math. When you set the base bevel to a degree, you now have a 91 degree angle. When you bevel the side edge to 3 degrees, the angle becomes 88 degrees, which is identical to 0/2. </Edit>
In general, small (< 1 degree) base bevel angles work best at relatively slower speeds. Because they hook up quickly and more abruptly, there is less margin for error. If your ski hooks up unexpectedly at speed, you can get hurt. I run .5 degrees on my slalom skis, but 1 degree for everything else.
In general, large (>= 3 degree) side bevel angles are necessary for good hold on hard snow. However, some skiers may find larger angles feel too grippy for non-edge-locked turns. 1/1 and 1/2 are probably more common for all mountain skiing, but plenty of folks use 1/3 as well.
Also, metal edges don't glide as well as your bases. So for speed events, larger base bevels get used all of the time. I believe Billy Johnson won the downhill at Sarajevo (a glider's course) with 5 degrees of base bevel. Hermann Maier says the same thing. He makes a comment in his book about how people were speculating that he had a slow run on Birds Of Prey due to wax issues when it was really a result of picking the wrong edge geometry for the conditions.
Lifter plates help with edge hold because they move the forces that you are resisting closer to the center of the ankle. This reduces the levering action that works against your ability to hold the critical angle with your skis. They also give you more of a lever to work with when it comes to tipping. So yes, the same ski will be easier to tip if it is lifted and it will hold better.
Edited by geoffda - 5/5/2009 at 06:39 pm GMT