Questions about ftp accounts

[Fantom]

Ok so what im trying to do it make like 2 directorys

Public
Members

And have a pw on the members directory and public well just be public...And set up 2 ftp accounts one for people on my forums to use ( public one ) and one for my members to use..But i want the files in the member chat not to be seen by public unless u have a pw ( can do that ) but what i cant seem to do is limit what the members FTP account can do...Like deleting the .htaccess and other files...

So my question is can i limit the permissions of what the members ftp can do like moving and deleting stuff..and what directory's it can view and cant view??