>>I'm just wondering, is there a way to send private message via toolbar? Currently I have to open my private messages, find the user and send it, which is a little bit inconvenient. May be you can add some direct way to do it?
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>How would you proceed to identify the user?

I'm not sure yet about what control would be most sufficient here. May be autofill textbox with ability to invoke Search form. What do you think?