Edit: some explaining; you open the 20 report tabs at once, and then close them as you send them
That's what I've been doing for a long time when I found a "batch" of bad posts, but I always have to slow down because of the 4 seconds delay.
I'd say, once a user reaches the minimum of 4 seconds delay, it should be removed entirely. On average, the forum doesn't allow more than one page view per second, so (apart from some burst space) that would be the new limit.