I'd like the suggest the possibility of setting your profile picture specificly for the campaign. Perhaps link it to your character sheet with a check box to use the picture from your character profile? It's just something I personally feel could assist in giving you the immersion feeling. Sitting there in a fantasy pathfinder setting while having a Warhammer 40k profile picture shown. (Also, I'm aware you can turn the pictures off, or minimise them but why have them there in the first place then?) In short: Let us change our profile pictures for individual campaigns.