The Engineer wrote:
But it would be like submitting a script, no matter how good it is, to nBSG where they break out into musical numbers from Glee. It doesn't work within the constraints of the show.
Roddenberry liked to claim that Ellison's teleplay marked a dramatic departure from the series format, but it just isn't true.
You can purchase the teleplay (along with Ellison's outlines and plenty of background interview) or just read about it here