Help for SET JOINFLAGS:
SET JOINFLAGS allows a group to specify the flags assigned
to a user when they JOIN the group (if the group is open).
Note that this must be valid, else "+" will be set on joining
users. If no parameter is provided or the parameter is OFF, the
join flags will be returned to network default.
See "/msg GroupServ HELP FLAGS" for details of the different flags that
are valid here.
Syntax: SET <!group> JOINFLAGS [OFF|flags]
Examples:
/msg GroupServ SET !awesome-people JOINFLAGS OFF
/msg GroupServ SET !foo JOINFLAGS +
/msg GroupServ SET !foo JOINFLAGS +v
/msg GroupServ SET !foo JOINFLAGS +cfv