You can cutomize some options from FB-autosuggest settings page
- If the searchbox id is other than 's' you have to change to the serchbox id in your theme
- You want more or less than 20 results, you can change Max Results
- The width of the div where the results are displayed can be change from 'Div width for serch results', the width is in pixels
- If the div with the results is to close or to far from the seachbox, you can change in 'Margin-top of div results'
- You also can change Number of characters to be displayed from the post content
If you want custom changes or styles you can contact me at firstname.lastname@example.org