[Steven Zahm]

@ Jon

Yes, you should be able to add classes based on $level. The $level variable increments by 1 for each level. So, the second level the value of $level would be 2 and for the third $level the value would be 3 and so on.Something like this may work:

$class = 'class="cn-cat-level-' . $level . '"'; 

Then you would have to update lines 1010 and 1014 to add the $class.

Updated Line 1010:

$out .= sprintf('<option %4$s style="padding-left: %1$dpx !important" value="%2$s"%3$s>' . /*$pad .*/ $category->name . $count . '</option>' , $pad , $category->term_id , $strSelected , $class );

Updated Line 1014:

$out .= sprintf('<option %4$s style="padding-left: %1$dpx !important" value="%2$s"%3$s>' . /*$pad .*/ $category->name . $count . '</option>' , $pad , $category->term_id , $strSelected , $class );

That should do it.

I just added the same classes to the dev version of Connections so if you make these changes, they will be forward compatible; meaning, your CSS will not break.

PS: If you have a moment, I would truly appreciate a review as they really do make a difference. Many thanks in advance.
http://wordpress.org/support/view/plugin-reviews/connections