%BChanServ SET WelcomeInChan%B instructs services to send
WELCOME messages to the channel when a user joins, rather
than to the user as a private NOTICE.

This flag probably doesn't do what you think it does.
Don't use it.

Syntax: %BSET%B %U#channel%U %BWelcomeInChan%B <%UON/OFF%U>
