title: Vim CtrlP Plugin: Manually set root search directory?
body: <p>I have read through the docs but cannot figure out if this is possible.</p>
  
  <p>I want to keep the default setting of <code>g:ctrlp_working_path_mode = 2</code>, but I want the ability to manually override that for all buffers in the current window if I want.  </p>
  
  <p>Specifically, I want to issue a ctrlp command or change a ctrlp config variable that sets the root search directory, such that is uses that directory for all future searches, regardless of which buffer I'm in.</p>
  
  <p><strong>Bonus Question</strong>: Is it possible to set two root directories, so that it searches both of them and combines the results?</p>
  
  <p>Thanks!</p>