I hit it again:
An Error Has Occurred!
The last posting from your IP was less than 4 seconds ago. Please try again later. The thing you were trying to post was saved as a draft. This limit decreases substantially as your account becomes more established.
If this can be reduce
to 0 seconds once you've earned 1000 Activity or 1000 Merits, that would be great. The forum rate limit (1 access per second, burst allowed) should be enough of a limitation.
I get this error when reporting
a lot of spam.
I realize that you are a machine, but making posts in less than 4 seconds makes you almost super machine.

I think 4 seconds is a minimum reasonable time for posts made by humans, in order to avoid bots and spam from overloading the server. I realize that some tasks can be very quick to carry out, and this limit can come up against this speed. Despite realizing this situation, I don't think it is very viable for the forum to reduce this value even further. Even if it is exclusive to users with many merits and activity.