I've def seen more flood control in certain areas like the trade section, but in others like general chat it seems they have none. I've had connection issues too but I've never been able to double post because the flood blocks the second one, that's why I don't understand how they can do it if the control is there.
Also before my warn I know for a fact my flood control was only 10-15 seconds.
There are connection issues that last more then 30 seconds, when you see the page not loading properly when you hit respond and assume its not posted so you try again and again, while it was posted.
In all the subforum I post there is 30s delay, can't speak for everywhere of course, but you "knowing for a fact it's 10-15 seems self contradicting."