> when the option is set to true. Christof, would:
> 
>    renderingConfig: {singleLineBreaks: {% 
config.MARKDOWN_BREAK_ON_NEWLINE %} }
> 
> work? I assume I am missing something as we want the strings "false"
> and "true" here. I am not sure what value is produced by
> config.MARKDOWN_BREAK_ON_NEWLINE maybe 0/1.  (If this technique works
> it is nicer than how I have been modifying javascript with TAL.)

there are a few ways you can do that with jinja2

  {% if config.MARKDOWN_BREAK_ON_NEWLINE %}true{% else %}false{% endif 
%}

is probably the most basic one, but you could also do something like

  {{ config.MARKDOWN_BREAK_ON_NEWLINE and 'true' or 'false' }}

looks like at the moment we get 0/1 for the string value of the option. 
Just wondering... maybe we shouldn't rely on the string value being '0' 
or '1'