I can't get this to work, obviously every conversion comes with little bugs. Specifically I get "bad setter call getEditPolicy" which isn't set because we use a moderator policy for Ponder. It's automatically being set on the EditEngine and I'm not sure how to decline setting it.

I think the issue is that PonderQuestionEditor->getTransactionTypes() currently looks like this:

public function getTransactionTypes() {
  $types = parent::getTransactionTypes();

  $types[] = PhabricatorTransactions::TYPE_COMMENT;
  $types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
  $types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;
  $types[] = PhabricatorTransactions::TYPE_SPACE;

  return $types;
}

I believe:

• COMMENT and SPACE get determined automatically by using instanceof to identify interfaces the object implements, and can be removed.
• EDIT is wrong (you can not edit the edit policy of a question) and should be removed.
• VIEW is correct.

Removing EDIT should fix the getEditPolicy() issue, I think.