Well this seemed to work for me -.categories>li .category-children .icon, .category>ul>li .category-children .icon
Now on to control the layout of the sub categories !!!!! 🙂
I'm working on a plugin that programmatically adds group and/or user perms to a dynamically created category.
I mimicked the call used in the write API, but I'm not sure I'm constructing the perms correctly - and that still doesn't answer the issue of single user perms for a category.