Q: Do Stomps or Thunderstomps benefit from any other special rules,
equipment or magic items? Or vice versa? (p76)
A: No to both questions.
Now I'm not an expert of the english language, but here is my interpretation.
Stomp and Thunderstomp aren't affected by special rules/magic items on the character/monsters. For instance, if a monster has the multiple wound special rule, it wouldn't transfer to stomp/thunderstomp. That doesn't mean that the enemy being hit by a stomp or thunderstomp won't be able to use his special rules.