As you said PP, while not having a likeing for the process, you know what they're looking for and how to work their system. If it was truely efficient, then it should be able to spot that you're doing just that. Anyone who has the intelligence needed to get an fATPL and a M/E IR is probably intelligent enough to know that the answer to the question, say, 'Do you like to gamble?' is aways no - even if they did like the odd flutter on the geegees.
Regarding the extrovert/introvert types, I would say most people (including pilots) are a mixture of the two, and their type depends as much on the time of day and their mood, as their character. People on the extremes on either type should be picked out in a decent MCC course, if not before.
There are as many personality types as there are people and while I'm not anti all things pschological, things like this need to be based on sound empirical science. (I get the impression that most advocates of this type of nonsense also practice Feng Shui in their living rooms).
Phrenology - that's the way to decide who's going to be a good pilot.