(By Jeremy Collins and Jay Latarche): "Verbal compounds are lexicalized, often non-compositional, constructions which combine two or more verb stems. Languages with serial verb constructions can often have verb compounds too, however they might not always be described as such. (Code 1 if there is a conventionalized way of combining two verbal elements into a single lexicalized phonological and grammatical word. Code 0 if it is clear the two elements are phonologically independent.)"
In the Grammaticon concept "compound construction", the construction is productive (and hence semantically regular), and "phonological wordhood" plays no role. Moreover, verb compounds are special kinds of serial verb constructions. (A notion of "non-compositional construction" is impossible in the Grammaticon.)