If anyone's been struggling with getting this plug-in to search pages instead of posts here's what you need to do. (The author's explanation is minimal so I hope this post sheds some light on things)
Step 1:
Add a field in the interface, the label can be anything as it won't show up in the end interface. I suggest "Hidden pages value" or something like that
Step 2:
Set the data type value to "post type"
Step 3:
Set Widget to "hidden constant"
Step 4:
Compare should be "equals"
Step 5:
Set widget config to "Page"
Should look for pages, not posts now. Useful if you're using WP as a CMS
http://wordpress.org/extend/plugins/wp-custom-fields-search/