http://chatty.github.io/

This Twitch Chat Client has an option to Follow/Unfollow the joined channel via Right Click Menu(http://i.imgur.com/Wrnn59v.png). Is it possible to do something like this for mIRC?

https://github.com/Poorchop/hexchat-scripts

Hexchat also appears to have this capability by a simple '/follow channel' or '/unfollow channel' command from an external script.