I think posting series of a story after the original makes it easier to keep the stories straight (and findable for someone looking for them)

Thats my 2 cents worth of opinion anyway.

As for comments, maybe the author could state in a prelude to their story if they want comments after their stories (for stand alone stories) or in the comments section for stories with multiple chapters, or continuation stories.

That way it could be the authors choice.
Cylk Silentstrike
The whisper of death's sweet kiss that comes in the night.
Coming soon, to a Hib or Alb near you.