We would all agree that deliberate hesitation has no place in the game (as the Laws state).
Probably more important is the fact that West's innocent hesitation, whilst considering lunch for instance, could still lead to an adjusted score:
Quote
Law 73 Communication
F Violation of Proprieties
2. Player Injured by Illegal Deception
If the Director determines that an innocent player has drawn a false inference from a remark, manner, tempo, or the like, of an opponent who has no demonstrable bridge reason for the action, and who could have known, at the time of the action, that the action could work to his benefit, the Director shall award an adjusted score (see Law 12C).
In my experience hesitating with a singleton, with no good reason, is something that Directors will adjust on every time. Clearly considering lunch (a good example) is not a good bridge reason
If the Directors believe there was deliberate intent, then they issue a penalty too.
I believe this is one of the those areas that is poorly understood by most players, and so discussions like this are very useful. It is also an interesting example of where f2f and online play would demand different plays, since one has an established hesitation and the other does not.
Paul