This will now work as of Sprout Forms v2.2.0:

{# Ordering #}
{% for formEntry in craft.sproutForms.entries.formHandle('contact').order('address desc') %}
  ...
{% endfor %}

{# Filtering #}
{% for formEntry in craft.sproutForms.entries.formHandle('contact').firstName('Zoe') %}
  ...
{% endfor %#}