Yes, that is one.
I beg to differ a little Neil..Killl/stun shots are very commonly used by all top players, in a variety of different situations, and they know how to execute those shots correctly..If you are talking about 'b' players, thats a whole different enchilada! Thats why they will never be A+ players!
As you say, you have to use proper technique, and accelerate through the shot, so it is really no different than any other shot..Pocket speed and angle of the cut, actually have very little to do with it..It is all about being familiar, and comfortable with the dynamics of the stun shot..Bottom line is, top players will execute them 95% of the time..'B' players, maybe 20%..It is very much an acquired skill!
There is another reason to use this shot that hasn't been mentioned so far that I could see.
Kill/drag shots are especially common and useful when playing on tables that are not level or where the cue ball is old and misshapen.
Some people when they need to shoot softly to obtain shape, they will use a short backswing or less hand speed and if the table rolls off they will often miss the shot.
You can hit the cue ball with faster hand speed/stroke (as opposed to hitting the cue ball with a slower stroke,) but by hitting the cue ball below center you can slow the speed of the cue ball, defy the lean and still force the cue ball to travel as intended, just at a slower rate of needed speed to obtain required shape.
JoeyA
a drag shot is essentially a stun run through (as it's known in snooker)
and perhaps the single best shot to know and also maybe the toughest
vertical axis people, learn it
most wanna sidespin their way around the table which anybody can do on about day three of learning the game
running english is about the worst thing you can ever learn if you don't know stun run through, stop shots, and force follow/draw