Hi,
Would it be possible to add a feature when you click on someones name in any channel, you'll get a menu, like in slack, from where you can write direct messages or choose to send a direct messange and maybe choose other options as well.
You click on the name circled in red and get a pop up with more options and the possibility to start a private conversation and/or message him directly. Like this: http://imgur.com/a/YTIO7
Best regards,