DSM-G600, DNS-3xx and NSA-220 Hack Forum

I have a group with users. The group has full read/write to folder /FTP.
I want all users in this group only to be able to read from all subdirs except the /FTP/Upload dir where they should be able to upload files as well.

Because of the lack of different permissions to different folders i have chmod the directories to 0775 except for the /Upload dir that's been chmod to 0777 = it now works like i want it to work.

The problem is this is effected to all accounts regardless of using samba, telnet (except root) or ftp.
So i have to change permissions (temporary chmod directory to 0777) every time i want to transfer new files to the subdirectories (except Upload). Is there some way to archive this setup so i dont have to do this everytime?

Can i add my ftp and samba user to the 0775 group somehow?

Sorry if this is a very basic question but im a *nix newbie

Thanks,

marca