Folder Actions - Forgotten Items Workaround

Ok, we have a script that now properly sets permissions on files when the files are popped into the specified folder from an appication. On a regular basis, however, several of the files are just forgotten and not processed. I understand this is part of a timing issue where items added while the script is already running will not be processed.

My question is this, is it possible to make it so that a folder is Watched and every x seconds have a script run on all items within the folder? Or, does anyone have a good workaround to the orphaned file issue? Thanks!!