don't know about the security bit. The rest look ok.
check out my UBER SIMPLE (and not secure) smb.conf:
Code:
[global]
netbios name = foo
server string = foo
workgroup = MY_GROUP
os level = 20
domain master = No
map to guest = Bad User
security = share
domain logons = No
[JOBS]
comment = JOBS
writeable = yes
public = yes
path = /JOBS
you might want to try that one to see if it works at all. If so, you can start securing it from there.
... so with this, you'd connect like \\foo\JOBS