yes that's a problem, since it only tests if certain words are within the Post or not.
i have disabled this plugin atm, since it doesn't allow moderators to delete threads / posts where there isn't an filejoker-link.
We are going to enhance this plugin, asap the creator is notified or i have time to do so.
so up until then, it's temporarily disabled.
as a matter of fact:
filejoker-links should be posted above any other links : )
edit
i also notified chompy, about the flaw in the plugin. Let's hope this will be fixed soon.