Show status changes in chat window and in chat log
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ajaximrpg
When a user changes from "I'm available" to "I'm busy", it is subtle that the green dot next to his name changes to yellow. It might be better to also show a message in the chat window to make it obvious to other users who might be waiting for the user to say/do something.
Writing the status change to the chat log makes sense, too, since log readers don't have any idea how long things take ... except by seeing other users reactions.