Hi,I know that custom chat has been implemented already but for quite a long time this functionality is broken and therefore it is not possible to use in long term cause of possibility of unwanted people joining such channels (trolls, etc.). I believe that currently presented options of custom chat are more than enough if they wouldn't be broken.
My guild, has been using custom chat as a cross-guild chat (not only) for our main and levelling guild for long period (4 months) with success , until we encountered a spammer/troll, which we couldn't kick/ban from our chat. We were forced unfortunately to abandon our custom chat.
To summarise:
Current custom chat options are sufficient. It is not possible to use custom chat because of lack of moderation. My guild and many other would use custom chat if it would work.
Thanks in advance for looking into this.