Looking at your post history I see 1 maybe 2 times where you would have a problem with the 30 second rule. Is it honestly that much of a problem? It used to be somewhere around 70 or 80 then it was brought down to 30. I have never had a problem with the 30 second rule.
The only time I get the second delay is when I click on "My Posts" and "New Posts" at the same time, so it's kind of annoying at times but I could see why it exists.
As Julio said, if you had it any shorter the spam would increase.
I think we are beating a dead horse here. 30 seconds seems to be no problem with 99% of the posters here. Like Poertner said, take a break or something during that 30 seconds.
That's exactly what I thought when this was requested the first time. But vB doesn't allow this kind of customization by default and I couldn't find any hacks on the community site that allow for the option either