Instead of opening the screenshot you upload using Shift-F12 in your browser as soon as it's done uploading, why not be linked in chat? This gives two benefits: you can keep playing after taking a screenshot, and you have a little screenshot history in your chat logs. Plus, opening the screenshot in your browser isn't really expected at first...
I think getting a private message in a dedicated tab would work best, though it could be a line in #osu or the active tab or something.
I think getting a private message in a dedicated tab would work best, though it could be a line in #osu or the active tab or something.