Having problem in Suffusion with Multiple Authors ?

Authors are Admins?
If you give them an actual Author role, they will not see the theme options. However that might not be the case if you have any custom fields in the theme itself, simply because they will appear while the Author writes/publishes new post.

Author’s can:
Roles and Capabilities

However that might not be the case if you have any custom fields in the theme itself, simply because they will appear while the Author writes/publishes new post.

That is exactly what it is. The Additional Options section is a “meta box” in the Edit Page / Edit Post screen, which lets users set custom fields like a thumbnail, or an alternative title to display in the navigation menu etc.

@inderjeets,
From your description it is not clear as to who on your site should have rights to change the custom fields. The easiest way to do this is to modify the suffusion_add_page_fields function in functions.php to say something like this:

function suffusion_add_page_fields() {
	if (current_user_can('edit_theme_options')) {
		add_meta_box('suffusion-page-box', 'Additional Options for Suffusion', 'suffusion_page_extras', 'page', 'normal', 'high');
		add_meta_box('suffusion-post-box', 'Additional Options for Suffusion', 'suffusion_post_extras', 'post', 'normal', 'high');
	}
}

Mind you, an author would still be able to replicate the whole functionality in the meta boxes by simply adding the same fields through the “Custom Fields” section lower down in the Edit Page / Edit Post screen, so I don’t see the point of the above code.