Is there anyway to animate layer depth within a symbol?

I just discovered the new Layer Depth feature/window but noticed that it won't work if the layers you are trying to effect the depth of are already inside a symbol. Is there anyway to overwrite this? Like the way characters are rigged  is by using nested symbols, so for example the whole character is one symbole then within that symbol are the layers for all the body parts which are all symbols, the head is also a symbol that has layers for the facial feature which are all symbols. This tool would be really helpful but as it stands now we can't use it, unless i am missing something. Thanky for any help you can provide.