charghwI',
It should also be noted that the punctuation system as used in written English is generally derived from spoken English; and can be (and often is) used a set of "performance instructions".
I would go so far as to argue that apposition in Klingon can be done quite easily in spoken Klingon (while we don't have "rules" for it, the intent can still be clearly communicated) the same way that we do apposition in spoken English. Using common punctuation I can even clearly communicate the spoken difference:
{DuraS vav yIQoy.} vs {DuraS, vav, yIQoy} vs {DuraS, vav: yIQoy}. By the use of the punctuation you can clearly tell that different things are intended; and (based on dual-coding theory and semiotic conditioning) I'd be willing to bet that you read each one with a different pacing as well.
So, while the use of modern English punctuation isn't actually part of Klingon, it provides the Klingonist with a convenient way to encode aspects of pacing and phrasing that we lack an alternative way to communicate (in absence of clarification from Maltz). The dropping of a comma does change communicated intent, and is thus important because it is a vital part of Klingon as it is used to communicate within the community.
--jevreH