lucy24 - 8:29 pm on Apr 17, 2012 (gmt 0)
There was also a robots.txt option to delay Googlebot but that might be a bit more efficient than WMT.
If you mean crawl-delay, don't bother. Google ignores it. Or, possibly, googlebot may choose to ignore it if the directive doesn't suit its convenience. Which amounts to the same thing. Says gwt:
Line 15: Crawl-delay: 3 Rule ignored by Googlebot