With the editing board I understand your point (dealing with the footage one just shot), but the sound board seems to have a bigger disconnect from the broad term of cinematography, which puts screenwriting as a notion in my mind in the first place.
And I believe there are many technical elements within the craft of screenwriting beyond Celtx vs. MS Word. The formula of writing a joke for example has a nice helping of guidelines to follow (that many people are oblivious to until explained once). Other suggestions on how to type a page that "flows" not in terms of content, but line breaking and formatting.
This place already covers such a wide array of things as it is I figured "What's one more?"