Possibly more distinctions in current grammar than we would need to expose (e.g. def_explicit_q vs. def_implicit_q)?
Maybe introduce additional abstractions, e.g. ‘conjunctive’ vs. ‘disjunctive’ conjunctions. If so, implicit_conj might need to be sub-divided along that line.
E.g. compound, unspec_loc, etc. ... somehow, all the way down to the prepositions, e.g. directional vs. stative readings of She jumped in the water.