I think when people join a custom game, your tag abbreviation should be visible like it was back in Classic Wc3, And when you join a melee match would be cool if under your username was your clan name. Would also be a nice feature. Maybe add in an “Clan Match” option where you can join a match with clans and compete in melee matches with clan vs clan instead of being “arranged” or “random” just a clan war thing would be nice. And a leveling system for the clan, where you can get specific icons for your clan based on the level 
C’mon blizzard, ya know ya want to do it. :’)