I plan to be creating this. It won't be a plugin, or something completely different. It will just be a sleepscript. Just get that plugin, and I shall give my script to you once I'm done it. I'll begin to make it on the 10th, and it should be done in a couple days. I can use -run applscriptosx or something, I forgot. Tell it to put sc window up front, "keypress enter" "keypress "I want to say this"" "keypress enter" I wanted to do this so I can have a starcraft account logged on all the time, and have it send messages as fast, and as many as it can or wants to. No flooding. Ever. It will have an automatic rejoin a game, every 10 minutes or so. The only problem would be to be able to play and it send messages at the sametime. I guess I'll have to have the bot check if the starcraft account is in the channe or not. Then it will send the message, or just put it in a file, and the script will run it when it is in the game. It sounds doable, and easy.
Unless you aren't using mac, then this might not work.