I think it's safe to say that in general, A+ will start less conflict than A-, although A+ may be as much of a source of conflict, assuming that there are equal A+ and A- actors involved. But I think it is equally safe to say that N+ will be responsible for starting, carrying on and escalating conflict, whereas N- will be more likely to diffuse and avoid conflict, namely by avoiding escalation and emotions.
So, while F/T might not correlate directly to N+/N-, by virtue that F's are ~some 70% females, and females are heavily shifted towards N+, it can probably be loosely assumed that Fs from MBTI (by virtue of distribution) are more likely to escalate conflict, take things personally and get emotionally involved.
All of this happens regardless of the descriptors used to measure F in MBTI, which is why it seems so unusual. And really, it has no bearing on MBTI, it'd be more accurate to say the reverse - women are generally more emotionally reactive, most women test as F, as a result, more Fs are reactive if you normally distribute the reactivity.
You've got a point. The main problem is that MBTI is lacking in its ability to describe the spectrum of human personality. N+ will probably identify with F over T, yet will possess traits that contradict typical xxFx descriptions. Various measures of emotional intelligence, social skills, or emotional coping skills correlate strongly,
negatively, with big five N. Big five N is also related to less spouse satisfaction, more psychological disorders, more workplace conflict, ...
The NF temperament may be subdivided in 3 types depending on A/N combination:
1) A+/N- : The typical NF description, imo. It's safe to say that these people not only avoid conflict, but are slower to perceive slights, tend to see the good in others, trust others, are altruistic, interpret actions more positively, are self-confident, feel good about themselves, are slow to anger, and should possess more emotional and social coping skills (i.e. EIQ negative correlation with N). The stable concern about others would probably create a self-fulfilling prophecy that would make others more trustworthy. Statistically, though, I would predict that this type is under-represented.
2) A+/N+ : This type will probably build up more anger inside, be more depressed, be more anxious, be quick to try to resolve disagreement, be more dependent, ... all the while still believing people have good intentions and being altruistic. I think this type would be fairly common.
3) A-/N+ : I think this type may think they are borderline T if they overidentify with A-. Disagreeableness combined with Neuroticism makes this type quick to perceive slights, distrustful of others and even paranoid, pretentious, manipulative, quick to anger, anxious, self-conscious, with low self-esteem, self-absorbed and depressed. This type will probably be anti-authority (A-) in an unstable way (N+) and have difficulty obeying authority figures. It's probably safe to say that the manipulativeness associated with A- combined with N+ will make for an individual that is apt at playing many relationship games. I think this type is less frequent but may more easily have an interest in typology as A-/N+ typically has identity problems.