Bud
net very smart is it. but still works
It is as is designed and as detailed in the manual ie user/group control is for ftp & local network sharing, not web access.
See this contrib for added functionality, smeserver-remoteuseraccess-1.2-33.el4.sme.noarch.rpm
yum install --enablerepo=smecontribs smeserver-remoteuseraccess
Search the forums on smeserver-remoteuseraccess for usage info ie you can jail a user to only access a certain ibay after they login. Also check the dungog.net wiki.