title: Emacs scheme (scheme-mode) indentation
body: <p>By default, scheme mode in Emacs formats code using one space indentation:</p>
  
  <pre><code>(string-append
   "foo "
   "bar "
   "baz")
  </code></pre>
  
  <p>I want it to be at least two spaces, i.e.:</p>
  
  <pre><code>(string-append
    "foo "
    "bar "
    "baz")
  </code></pre>
  
  <p>For most modes in Emacs this is pretty easy to change, but I haven't figured out how to do it for scheme. I've looked at the source code for scheme.el as well, and while there is logic in there for doing all kinds of fancy alignments I haven't found a simple way of customizing the "standard indent".</p>