Quick Layer Organizer
Simply create a layer and name it specific to what should go into the layer, for example "CHAR" for character geometry. Any character geometry you make you just need to remember to include "CHAR" in the object's name and when the Quick Layer Organizer is run it will find any objects with "CHAR" in the name and put them into the "CHAR" layer. Any objects that don't match the name a layer will remain in whatever layer they are currently in and the default layer is ignored during the organization.
Drag the MZP file into Max's viewport and restart Max. Go to "Customize \ Customize User Interface..." and the tool can be found in the category "facerFX Tools".