Okay. So you left me to solve it myself.
I have a Linkstation 2 (Mips).
I installed OpenLink.
I had a look at the smb.conf and saw that encrypted passwords were already enabled.
I edited the webscript to allow longer user names and passwords.
I edited the smb.conf to allow read only access to some users and r/w for others.
I edited the script that overwrites the smb.conf so that it won't.
Is there any effort to add features to the web interfaces that aren't there on some boxes?
For example it seems that on the pro boxes you can add different permissions for different users.