I think you should consider whether this +/- is actually changing the functions themselves or is an emergent from the pairing blocks. I have reasons to relate to the latter:
The External/Internal across a block is basically a new dichotomy (in types currently called: Aristocratic/Democratic), as far as I can tell. The same "process" that makes Rationality, Decisiveness, Seriousness applies to it:
-
Fields+
Static,
Bodies+
Dynamic = Rational;
Bodies+
Static,
Fields+
Dynamic = Irrational;
-
Fields+
Internal,
Bodies+
External = Decisive,Serious;
Bodies+
Internal,
Fields+
External = Judicious,Merry (Alpha/Gamma values);
-
Static+
Internal,
Dynamic+
External = Delta values;
Dynamic+
Internal,
Static+
External = Beta values; note that this is an
actual IE/AE/function
dichotomy, it's not just some trait that Beta and Delta have in opposition, just that no one cared to name it so far (in fact I did).
-
Internal Base+
Internal Creative (NF, FN),
External Base+
External Creative (ST, TS) = Aristocratic (judgmental);
External Base+
Internal Creative (SF, TN),
Internal Base+
External Creative (NT, FS) = Democratic (nonjudgmental, observant).
As you can see, every time two fields that require external support, or ones that don't, pair together, one way or another a sort of judgment, premeditation, decisiveness emerges in the personality type. Also note that such things as Rational (Skizotymic), Decisive, Serious are not to be found in the Information Aspects, for instance, there's no such thing as determination, planning, judgment, decision in
, the structural information, but the Socionics Rational is exclusively explained as emergent
in the psyche (original Socionics explanation of Schizotymic, not the later online versions, perverted with Jung misinterpretations and MBTI mix-ins), when such Information Element is placed in the Base function. Certainly, "Rational/Judging" IAs have something in common, but we address them that way only for convenience, not because they, as actual aspects of information, are "judging/rational" by themselves.
Furthermore, +/- comes only in bundles of Dual functions. It's impossible to distinguish +Se from +Ni, as far as I can tell, and that's because it always applies to (Se,Ni), (Te,Fi), etc.
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These are just few reasons that make me believe that we should not hurry to assign the +/- properties to the IEs/IAs. As traditionally the IEs are strictly based on IAs, and denote exclusively that a certain IA occupies a certain position in the psyche (as a function), I think it's better to maintain this +/- as it is, as a high-lever explanatory concept, somewhere above functions and IEs, but below type (as quadra values is).