For clarity: the hanging indent filter above inserts `\item` in front of every entry, and requires the definition of a  `references` environment in a template:

~~~
\newenvironment{references} {\list{}{% hanging indent, src/myfilters/addRefEnvItem.hs
    \leftmargin1.5em%
    \itemindent-\leftmargin%
    \itemsep0.5ex%
    \parsep0pt%
    }}
    {\endlist}
~~~

I wonder whether the latex writer itself shouldn’t insert such a `references` environment by default. Hanging indent is required by many styles anyway but could be redefined as necessary.

Even better, pandoc(-citeproc) could parse the CSL `hanging` and `second-field-align` flags, and inject appropriate formatting instructions into the `references` environment.