Need more CSS hooks on top level elements

This applies to custom search blocks.

Is there any way you could add css classes to any container type div elements.
Can you also apply a class to any "Labels Text"?

Example 1: the content type list as checkboxes are contained in a top level div with no classes(well just form-item form-item-labeled). That means I can't restyle that container unless I use jquery to add the class at runtime.

<div class="form-item form-item-labeled">
      <label for="">Or Search for: </label>
    <div class="form-checkboxes custom-search-selector custom-search-types"><div class="form-item form-option" id="edit-custom-search-types-c-all-wrapper">
    <label class="option" for="edit-custom-search-types-c-all"><input name="custom_search_types[c-all]" id="edit-custom-search-types-c-all" value="c-all" checked="checked" class="form-checkbox custom-search-selector custom-search-types" type="checkbox"> -Any-</label>  </div>
<div class="form-item form-option" id="edit-custom-search-types-c-group-wrapper">
    <label class="option" for="edit-custom-search-types-c-group"><input name="custom_search_types[c-group]" id="edit-custom-search-types-c-group" value="c-group" class="form-checkbox custom-search-selector custom-search-types" type="checkbox"> Group</label>  </div>
<div class="form-item form-option" id="edit-custom-search-types-c-page-wrapper">
    <label class="option" for="edit-custom-search-types-c-page"><input name="custom_search_types[c-page]" id="edit-custom-search-types-c-page" value="c-page" class="form-checkbox custom-search-selector custom-search-types" type="checkbox"> Page</label>  </div>
<div class="form-item form-option" id="edit-custom-search-types-c-profile-wrapper">
    <label class="option" for="edit-custom-search-types-c-profile"><input name="custom_search_types[c-profile]" id="edit-custom-search-types-c-profile" value="c-profile" class="form-checkbox custom-search-selector custom-search-types" type="checkbox"> Profile</label>  </div>
<div class="form-item form-option" id="edit-custom-search-types-o-user-wrapper">
    <label class="option" for="edit-custom-search-types-o-user"><input name="custom_search_types[o-user]" id="edit-custom-search-types-o-user" value="o-user" class="form-checkbox custom-search-selector custom-search-types" type="checkbox"> Users</label>  </div>
</div> 
</div> 

Example 2: the custom search block has form element that basically wraps everything in the block. Inside that form element is a div that wraps everything else. Can you apply a class to that div?

Overall, I think adding some more css hooks would make it even easier to style.

Thank you for making this module.