Does Global Site Search improve on the actual search functionality?

Hi, you guys are probably well aware, but the default WordPress search functionality is woefully lacking in it's capabilities. I'm looking for a solution for searching multisite posts (which this plugin accomplishes), but I'm also trying to add some additional search capabilities (specifically, boolean searches). That said, does this plugin extend the default functionality in any way, other than allowing multisite search, and if not are there any hooks that would allow me to make modifications to the queries before execution?