Locational 'There' Or Existential 'There'?

Cf On the wide flats beside the noisy river there were marshalled …

If in many companies is how they were marshalled, then Manner;

If in many companies is where they were marshalled, then Location.

Tagged Imperative Or Metaphorical Interrogative?

The first analysis treats this instance as a tagged imperative clause, whereas the second treats it as an interpersonal metaphor of mood: a command realised as polar interrogative clause. Cf

This raises the question as to whether the tagging of the imperative facilitated the genesis of the metaphorical variant.