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Read the comments by the late great Ozz on this thread
He tells people how to set one engine, but have it randomly rotate the google engines it pulls results from
In an ideal world, you will only have one engine selected to reduce duplicate search results
But, with google, too many hits and the ip gets slapped
In the past I did some test results with about twenty different, then other did similar tests
The results were all about the same with a six place spread
you can select search engines that use extended syntax by popup menu.
@miki this is indeed hard to do. Sorry, but I don'T have a good idea to measure this.