Filezilla For Mac Snow Leopard

So here is the issue. A client of mine is using Mac OSX Snow Leopard as his web server.

Mac OS X Leopard (10.5)users equipped with PowerPC chipset have to download FileZilla 3.2.4.1 for PPC. Mac OS X Tiger (10.4 or higher) users have to download Filezilla 3.0.6.

He has multiple clients, and sites, etc. He also has multiple designers who access the system.

He has a user who he has locked down to certain directories (for sites he only works on). When the user uploads his files, my client has to go in a root to set the owner to _www so that Apache will have permissions to run the files. What he'd like to know is remove the need to constantly have to go in behind the user to propagate the permissions on the files. In Windows, he is just using Filezilla without a problem since the user isn't integrated into the OS.

Any ideas how to accomplish this?