Folder structure for shape keys

As the shape key list gets cluttered fast, there should be at least a possibility to have a folder like structure or some kind of tags, to order the many different shape keys that might be made in a project. For example - there can be SKs (Shape Keys) for the Face of a Figure. Then another kind of shape keys are for corrective Sks - shoulder, legs, feet...

One might have special SKs for some parts of clothing, and some others for another part of clothing. Some helper keys for simple movements of hair and a fast way to animate a one time hit of a Boyers glover against a cheek. Some SKs might be made just for the blinking of the eyes......And so on. And if possible there might be a second and/or third level,....for example: The blinking eyes could be a second level to the face SKs. And those folders should be collapsible, like in the outliner, so if I'm just working on the facial animations, I need to only open the corresponding face shape key-folder - and all the scrolling is gone, or at least drastically reduced.

Those horrible long lists with all the shape keys really need a deeper way of ordering.

Please!