No need for that command you can just Download a mod and it will always show up with your ping without typing a command everytime to show you what ping you have, what about if that ping you have saw have just changed after you have typed/ping?, So i believe that downloading a mod is better cuz it will 24/7 show you how is your ping going. I believe that this is better than wasting Owners time on making that plugin in all servers.
i believe you're right, but this is important to pvp servers that they can check their ping every once in a while... or maybe every seconds. i have the 5zig mod that shows the ping, but its too slow, i wanted it to be updated every second but it doesnt, /ping would help a lot