I'm wondering....is it possible to use a watch folder with a project-collect filesfolder in it that waits until the place holders in the folder are replaced with all of the right footage? when it get's the right footage it should render. Now it renders no matter what is in the project, resulting in an empty movie.
No. That's just how it works - the watch folder responds whenever a file is changed and thus the folders own "last modified" timestamp also changes. Once files have been added, there is no way to delay or change their queueing. if you need such functionality, buy a commercial network render management tool such as Deadline or Qube.
sounds convincing. I will look into those network render programs. Thanks very much for your to the point answer.