expected behavior

"block_quote": {
  "margin": 2,
  "indent": 1,
  "indent_token": "| "
}

should presumably push the block quote 2 columns from the document edge and display 1 indent_token

actual behvaior

There seems to be no difference between margin and indent, and both increase the number of indent_tokens displayed. Thus, you cannot increase the margin between the quote and the document edge without messing up the number of tokens displayed.