At the moment there are only three simple hotkey ping options to quickly communicate with your teammates.
Ranked Teams are right around the corner, the game requires more ping communication options.
Implement a ping wheel system, when players will hold a hotkey down an interactive communication “bubble/wheel” will appear on the screen and players can quickly use their mouse cursor to select which message to convey to their team during the heat of combat.
I may even recommend a Voice Chat feature for matchmaking, being able to communicate with random teammates, supported voice communication in-game is a must.