These are commands I would like to see in the game. These commands either do not exist or currently have a limited function.
/leavechannel - This is already in the game, and can be used to leave the general chat. But it would be great if you could “leave” a private message so it no longer appears when TAB cycling through chat channels.
/recent - Opens up your recent players tab. Quicker way to start avoiding people 
/[hero name] - Will open up that hero’s info in the hero gallery. Quicker way to equip cosmetics. Will only work out of match when in the main menu.
/cancel - Will cancel the queue. Will only work out of match when in the main menu and queueing.
/profile - Opens up your career profile.
/friends - Opens up your friends list. Can be shortened to /FL.
/options - Opens up the options menu.
/LFG - Opens up the LFG function. Will only work out of match when in the main menu.
/mute [hero] - Mutes the voice lines of the player playing the specified hero. This essentially is a text command for “squelch chat”. Muting will carry over when player switches hero.