Vertex groups and Shape keys functionalyties

So, I've been using these featurres intensively lately and there are a few things that I would very much like to see implemented, such as a 'clear empty groups' for vertex groups (or clear below certain ammount), consider the situation where I want to put automatic weights on a hair, I won't need the weights from the toe. And the second thing is a 'copy shape keys' , because, currently u have to 'new shape keys from mix' which grab all active shape keys, but I just want to copy ONE existent and mirror it out. I'm not sure if here is the place to post it, but there you go, those are my suggestions which a deem reaaallly necessary!