One of the interviews I saw offered other...email me with your answer as a choice for several of the questions!
"None of the above" or "ask me directly" or something would be a good thing, but it seems that most folks don't think to offer the choice.
I'd also like the ability to skip over a question that doesn't apply to me.
But I suspect there is no essay question so that one party can email the other with a "why'd you choose that?" or "here's what I meant" essay. It would get the dialogue started.