Hmmm, not really beginners but,
..a script to generate a follicle spine would be a time saver.
Something that can collate all the orient constraints on the rig neatly and consistantly.
A script that would add the inbetween rotation expression to eyelids and forearms.
A script for making a selection of inbetweened blendshapes driven by one attribue more intuatively (perhaps even with its own animation graph.
A joint tool that helps you intuatively set orientation correctly.
Something that can help with naming conventions or placing rig controlls correctly within the hierachy.