I don't want pages to be included in my search, so In installed this plugin (version 1.7.2). I clicked on Settings > Simply Exclude > Manage Pages. "Include only" is selected, and none of the pages are checked. I expected that searches would now search posts but not pages. However, searches are still searching everything.
I experimented some more with the settings, and one of the tests involved checking the About page -- I wanted to know what would happen with one page checked. Searches now search that one page and exclude all other page, as I would expect, but searches also now exclude all the posts!