I have 5 accounts under my own Bnet setup. My husband has his 5 accounts under his own Bnet setup. We didn't move them the Bnet accounts until this past Monday. When we created the individual accounts, we put them all under the same authenticator. They still use the same authenticator now, so yes, separate bnet accounts can use the same authenticator.
As to whether or not the separate Bnet accounts will jiggle around this new annoyance, I couldn't tell you, though.
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