I've been trying to extend the concept of "ambiversion" to come up with an 81 Type system, which would basically combine MBTI with both Five Temperament Theory (which is based on moderate scales) and Enneagram. I had put up a preliminary model that excluded the functions (which I had not fully learned yet), but always did want it to use the functions.
The way it works, is stating with expressed and wanted behavior (e/w) in both Inclusion and control, which equates to Interaction Style. So the four factors are E/I (eI), Directing/Informing (wI), Cooperative/Pragmatic (eC) and Structure-Motive (wC).
So to get from 64 types to 81 types; instead of just two poles, you add a moderate score. So between E and I is A, for instance. Where it gets difficult is the fact that the other three factors don't neatly correspond to S/N, T/F and J/P. But just using moderate scores between E/I, D/Inf, C/U and Str/M, you end up with nine temperaments and nine Interaction Styles. These then make neat correspondences with Enneagram sp and so areas (I believe the variants should be mixed types).
So if ISTJ was a pure Melancholy 5so/sp, ESTJ is a Choleric Melancholy 8so5sp, then ASTJ would be inbetween Melancholy and Choleric socially, which the 1 seems to fit into, thus 1so5sp. Since the other three factors besides E/A/I all use the other three dichotomies in a very intertwined way, it is more tricky to change the other factors. And the functions are even worse.
So what I was trying to do was list all of the possible "X" combinations as far as what they would mean for the functions.
X--- (A---) Dominant Function is ambiverted (both e and i="a")
-X-- Prefer both S and N (Pe/i)
--X- (We can call it "Y") Prefer both T and F (Je/i)
---X (We can call it "Z") both preferred functions are extraverted
Some examples:
ASTJ Se/i-Te (Sa-Te)
AXTJ Se/i&Ne/i-Te (Pa-Te)
ASYJ Te/i&Fe/i-Si (Ja-Si)
ASTZ -Se&Te- (?a-Je Here it starts to get conflicting)
EXYJ Se&Ne/Te&Fe- (Pe/Je-)
EXTZ Te&Se/Ne- (Te&Pe-)
ESYZ Se/Te/Fe-
It seems such an interesting idea, but then, I just get mentally exhuausted and put it aside. I imagine that is Te work, and I can only stick with it for a limited time, until the framework breaks down, and then it's no fun anymore.
Anybody out there want to take a crack at these: AXYJ (xxxJ), AXTZ (xxTx), ASYZ (xSxx), EXYZ (Exxx), AXYZ (xxxx)?