sync only when file/folder present?

I want to use Hazel to keep Wordpress plugins updated across a number of local development environments. I can already sync the entire contents of a master folder to various locations, but what I really want to do is have Hazel sync files only when the file is already present in my destination folder.
Presently, I have the following option invoked:

But what I really need, and that I can't find, is something like, "If the file doesn't exist, don't copy it."
Is there a way to do this?
p.s., I really wish Hazel was a standalone app. Dealing with things in the tiny window of the System Preference is a pain in the backside.
Presently, I have the following option invoked:

But what I really need, and that I can't find, is something like, "If the file doesn't exist, don't copy it."
Is there a way to do this?
p.s., I really wish Hazel was a standalone app. Dealing with things in the tiny window of the System Preference is a pain in the backside.