OSX security issue - rights on Frameworks directory

I noticed that the Frameworks directory in the Unity Webplugin has read/write permissions for everyone. I see that the reason for that is to download relevant player bundles. As a University Systems Administrator this raises some concerns for me however:

• In a multiuser environment, someone could add malicious code to one of the bundles that would run in the next users' context

• Someone could block the download of a bundle by adding one with the same name and setting the permissions to read only

• I don't like to have world writeable directories in random places.

How do you advise to handle this?