You'll need a software or hardware solution to do it at the same time.

Keyclone has a mouse click broadcast, but due to WoW needing to be in "focus" to click, changing to each screen is somewhat slow.
Take a look in the software section, you should be able to find something there. I think Octopus and HotKeyNet also had solutions..but I haven't used them.
Also note, mini-map ping has been removed so it can no longer be used.

Good luck!