Pause Scene Posting When Challenge Reaches a Certain Point Number
This one might be a bit hard to get across, but when the Narrator sets up a challenge, allow them to specify that player posting should be "on hold" when a certain number of challenge points have been played. This is to allow the Narrator to interject and continue the scene with new information.
For example, on a 8 point challenge the Narrator may put a hold on posting once 3 points have been played then again at 6. This will let them add more information at set times.
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David Sahlin commented
On top of that, you could have the narrator save a Strong and Weak outcome draft, so that when the time comes they just have to put in a little polish and post it, for no down time.