For the scene-break, I'd go for the
but also include a class for scenebreak, so you can easily edit heights to your own preference.
Code:
<p class="scenebreak"> </p>
and in css
Code:
p.scenebreak {margin-bottom:1em;}
Slightly more difficult than the SIMPLE wanted, but if you're using the css and the h#+p rules, then this addition would be just as simple - once you've gone through you html (or rege'd it) to add the scenebreak class to all your required empty scenebreak paragraphs.