Quote - I cannot seem to find out what dials Poser includes in such a morph and what it does not.

In an FBM, Poser includes any targetGeom (morph) channel who's dial values is none zero. Nothing more, nothing less. valueParm (FBM) channels are not included, the influence of an FBM channel won't be saved to a new FBM  (but see below).

Things get complicated in some DAZ figures, eg V4, because they contain a hidden actor "bodyMorphs", this actor can, and usually does, contain targetGeom (morph) channels that are linked to valueParm channels in the BODY actor via linkParms statements in the 'figure' section.