Let Narrators limit posting frequency
Narrators can suggest a pace, such as "Normal (2-3 scenes per week)", but Players able to move more frequently than the suggested pace risk moving the story too quickly for others to participate.
In lieu of a fixed posting order, it'd be helpful if Narrators could optionally enforce move frequency limits on Players to prevent some Players from running away with a Scene.
For example, Pat and Erin are playing a Scene. The Narrator could configure the Scene to prevent Players from moving more than two more times than any other Player in a 12-hour span.
Pat moves twice in the Scene and submits a third move. The Scene automatically queues Pat's move for 12 hours and pokes Erin.
If Erin moves before that time, Pat is notified and Pat's post reverts to a saved draft. If Erin doesn't move in time, the Scene plays Pat's third move.