It emerged when I introduced ClientConfiguration that there is general consensus that Instance.getConfiguration() should never have existed...Instance is supposed to be about the client, AccumuloConfiguration is supposed to be about the server. We should pull it out. We should also decide if this was really part of the public client API, in which case we probably want to think about a suitable replacement (maybe implemented in terms of ClientConfiguration).
Keith Turner said he was looking into whether or not he wants to do it for 1.6.0. If not, I'm interested in looking into it for a future release, as part of a bigger effort to push ClientConfiguration deeper throughout the stack.