Is there a way to dump the private key for the dividend address?
From what I’ve been able to determine, there’s no direct way to dump the priv keys for dividend addresses directly from Nu. There is, however, a work around:
If you want to do it manually, you can use exportpeercoinkeys from the console, or, from in the wallet (when looking at the NuShares unit), using the menu option under Shares > Export peercoin keys.
When using either, you need to have your Peercoin wallet (Core or Peerunity) unlocked. This is fully unlocked, not just unlocked for minting.
Once you’ve moved it over you can use the dumpprivkey <address> command from your Peercoin wallet.
Thanks, Ben 
@Ben do we have a repository / wiki to collect this knowledge? I expect a lot of questions like this one