title: Using TeamCity build templates how can I remove "Clean all files before build" from the template?
body: <p>I have a number of daily and in-response-to-svn-change builds that all derive from the same configuration template. I can set it so I can choose what branch to look at, what build steps to carry out and of course what triggers the build.</p>
  
  <p>However I would like the daily builds to do a completely clean checkout, whereas the svn dependent ones (that obviously happen throughout the day) I am happy for them to simply to an update.</p>
  
  <p>Simply un-setting the option in the template does not let me set them in each of the derived builds. Is there a build parameter that I can use to switch on clean builds for those builds that require it?</p>