Thank you, Gbaird, for your answer, but that's not really an answer to my original question...
For various reasons, I really need to find out how to disable this fine security feature in Samba, just imagine if I need to enable this on just SOME ibays, but not on other?
I used to manage this on earlier versions of E-smith (security in samba obviously lower, or I was younger then...), but in 6.xx those methods just don't work anymore.
Anyone smarter out there???