On Wed, Aug 16, 2017 at 11:23 AM, mayqel qunenoS <mihkoun@gmail.com> wrote:

Does adding the {-pu'} to the singular form of an inherently plural
noun, as in the case of {mangpu'}, indicate "soldiers scattered all
over the place" ?

No, why would it? {-pu'} doesn't have any notion of "scattered all about". That's {-mey}.

So, as I understand this - and someone correct me if I'm wrong - it
isn't grammatically wrong to add a plural suffix, to an inherently
plural noun; it is just that the resulting word/meaning is
strange/awkward.

It sounds strange and awkward because it is grammatically wrong. It is, in fact, possible for Klingons to say things that are not 100% grammatically precise. That section of TKD is about such grammatical errors, specifically the ones commonly made by children.

The use of {bIH} with {ngopmey}, isn't grammatically wrong.

It is grammatically wrong, but the main error is the {ngopmey}, not in the verb agreement. If {ngopmey} were an acceptable plural word, {bIH} would be the proper word to go with it.