I'll be putting it on when I'm looking for RP or open towalk ups . If actively RPing, it should be pretty easy to tell if a scene is open or not, so I don't feel it's strictly required for that.
If I don't feel like being IC or advertising that I want to RP, I'll not put the status icon on.
If I don't feel like being IC or advertising that I want to RP, I'll not put the status icon on.