1) (Supernode) "Import Lockbox" > "Done". The "Import Successful" window has the text "If the lockbox is not new and has been used before, Armory will not know about its history until you rescan the databases" which isn't true in supernode.

2) In Lockboxes, select a lockbox and then use the arrow keys up or down. The bitcoin address displayed will not update but when you go to click on almost everything you are actually using the new wallet. You need to click on the lockbox to update the displayed address.

3) "Lockbox" > Check "Simul" > "Merge Promissory Notes" doesn't provide any warning if you create a transaction and don't provide a fee.