The existing forums average something like 5 posts per day or less. IMO it's unnecessary to implement the type of restrictions seen on forums with hundreds of posts per day.
If anything, I would see if the forum owner could enable topic preview, where a portion of the first post comes up in a pop up box when you hover the mouse over the title. I've used forums with that feature, and it is really helpful, as even on heavily moderated forums, the titles don't always predict whether or not one wants to engage in the discussion.