I don't think seeing an extended version of it would help, my problem with the movie was not that there wasn't enough of it.

the cut up version takes away alot of the story and gore trust me youd like it alot better

Would it make the characters less superfluous or the deaths less contrived and predictable?

yeah actually it would

so the extra plot gives all those pointless characters some meaning, and makes it so you can't see the deaths coming a mile away? Okay, I'll give you the character one, and maybe the added plot would make one not see one or two of the deaths coming (the dog is the biggest example), but you'll have to explain how it'd make them less contrived.