Awesome work. Only thing that isn't ideal is that once a Whisper chat is started it then maintains in the alternate window instead of the main chatroom. From a streamer perspective it would be nice to see the whispers to you in the main chat.
Do you mean the groups that can be created within a stream? I believe any twitch streamer can create a room/group channel to chat in.
"once a Whisper chat is started it then maintains in the alternate window instead of the main chatroom" whispers/private messages do not have a chatroom association in the context of IRC.
With that said, this is simply an avenue of getting whispers to work on mIRC; from here you can use stuff like
on openoron textto display the whisper where ever you like as though it was received straight from the IRC server."Do you mean groups that can be created within a stream" - Yes and no. That's a part of group chatting but there's also chats that sit outside the context of a streamer's chat that i'd like to support aswell.