Since this was written, we did introduce different edit time limits for new users versus established users. It made sense – it helps prevent spam and other unwanted behavior by new users, while letting established users have more freedom. The site settings are post edit time limit and tl2 post edit time limit:
What you could do in this case is lock the edit-happy user to a lower trust level (TL1), which has a stricter, less generous, edit interval.