Thanks for bringing this to my attention – I’ve added a filter to the site title link as well which will appear in the next version.
I updated the code you linked to with the new code with the filter. Once the new version is out, you’ll be able to use this:
add_filter( 'generate_site_title_href','generate_custom_site_title_href' );
function generate_custom_site_title_href()
{
// Enter the URL you want your logo to link to below
return 'http://YOURURLHERE.com';
}