I wanted to float an Idea.
How about we have have Dictated scenes only?
Dictated scenes: the current player choses what happens during the scene.
-Decide where to put the scene in history and review what we already know.
-Then narrate what happens to answer the question.
The PbP format does poorly for the free-form Microscope scene mechanic (e.g., Push).
To Push someones contribution, I would think is more likely if you had body language and verbal tone, to soften the blow of what is otherwise a creative blocking.
By my gut calculations, if we are at a 2-3 days response time, we'll get through a regular scene in about a month or two.
We could also try a Dictated Scene+Thoughts, where we all still pick characters and reveal their thoughts . . . and then the creator of the scene, with the added information, dictates how it plays out.
That would take 4 responses, and get scenes done in just over a week.