Display only featured image of post/page in search results

This plugin only query the result. It is depend on you how to manipulate the display of the result.

So the answer for your question
1. yes
2. yes

But this plugin wont do it for you, you have to do it by your self. Just customize your search.php. in your while loop. For example

if($_GET['s'] == 'wqsf09be82574' )//to identify is the search result from wpsf
{
<--! here you can styling your result for wpsf result! or use get_template_part() to include the template that you need to use-->
}