Amazon Downloader files

I'm using the Amazon downloader with a non-admin account and a non-standard iTunes Music location. Because of my nonstandard settings, that crappy app can't import the MP3s into iTunes. I've written a Hazel rule that does this, but there seems to be a small glitch: It does not work for newly downloaded files, the Growl notification says "Could not import file ...". When I select "Run rules now", the file gets imported flawlessly.
Probably the file was not ready when the Amazon Downloader put it there, maybe it copies instead of moving or does other modifications. The solution for this would be to wait some time before importing. Unfortunately I found no option for this: The granularity of the rules is too coarse (no rule like "modification date is older than 10 seconds") and the actions don't contain something like "wait 10 seconds before continuing". Is there any solution for this?
Note that I don't want to copy/move the file, I want to leave it in place an just import it into iTunes when the Downloader has finished.
Probably the file was not ready when the Amazon Downloader put it there, maybe it copies instead of moving or does other modifications. The solution for this would be to wait some time before importing. Unfortunately I found no option for this: The granularity of the rules is too coarse (no rule like "modification date is older than 10 seconds") and the actions don't contain something like "wait 10 seconds before continuing". Is there any solution for this?
Note that I don't want to copy/move the file, I want to leave it in place an just import it into iTunes when the Downloader has finished.