Default file permissions

[Roey D]

I have a server running Azureus to download torrent files. The Azureus
directory is accessible to other computers using samba.
Azureus dumps it's completed files with the 644 permissions, making
them writable only for the owner.
As far as I looked, Azureus cannot be configured to dump it's files
with different permissions.
Is there any way to apply a "Inherited file permissions" on a specific
directory? (i.e all files created on this folder will have a specific
permission set, unless specifically changed by some application)
 I prefer doing this with the classic permission system, rather then using ACLs.

Thanks,
Roey