Not entirely same idea, but I think that some of the key VCPD sounds should be added to keybinds. For example, perhaps you could add a /m1 command which would shout "This is the VCPD, pull over to the side of the road!", then /m2 "VCPD, stop and surrender now!", and /m3 "Stop and surrender or we will open fire!". All of those commands would play one out of the few chosen situation appopriate VCPD megaphone sounds.