Willie, I would have to disagree a little with your sentiment about the Airbus inference you refer to, if we look a little closer the PF has his own duties while the PM conducts theirs. If you focus on their job rather than yours, or task switch in HUman Factors lingo, you will lead yourself open to additional slips and lapses.
As for disconnecting ground personnel, your brain allows you speak and watch action, two seperate single channel processes for the brain. I would argue that you can disconnect him while monitoring PM duties. Just do not get distracted by looking out the window until the PM has finished, otherwise the previous paragraph applies.
Forgetting or running over the dispatcher is also one of those items that will quickly have you grounded. In my humble opinion, get rid of them as part of your flow. A deliberate inaction, Not disconnecting the dispatcher, while awaiting another action, Status Review from the PM, increases the chances exponentially that the intended action will be forgotten. Complete your sequences in their entirety, or start from the beginning.