Could ping(ms) be shown in the client?

Ikr, I can be hard to believe someone who says their lagging(as much as I want to do so)

I think they can't for IP reasons, to ping a server you need also an ip, and if you try to ping their servers with the tool they allow you to download you'll notice that the ip given is a proxy one, that redirects to you the value your ping should have, i'm in europe and when i tried to ping it manually from the terminal i noticed that the ip i was pinging was in america, they do this to prevent people to ddosing their servers or trying to develop hacks and cheats.

It changes once you start a game up so I don't really see how it's going to help if you see what it is in a none game setting.