oh ok i see what you mean now as well, why not just tell them that you'd like them to not use that feature! It saves alot of time and if you explain to them why i'm sure they'd do it! Most people use the "appear offline" feature when they want to see if its worth signing in - if theres anyone online that they want to talk to. They could use it anyway and then if they saw you online they could then come online and talk
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