Sorry your razer naga and the specialty keys from a gaming keyboard aren't compatible. Frustrating if that's what you were planning on.

A controller isn't as configurable as a razer naga, but for everything except chat it holds its own quite well versus a standard keyboard / mouse. (Controller > keyboard/mouse for movement and activating skills. Keyboard/mouse > controller for targeting and ground-placed actions. Overall, it's pretty much a wash, and some players prefer one, some the other.) The only thing you definitely want a keyboard for with the PS4 is chat, but any regular keyboard works for that much. I think most PS4 players go with keyboard for chat and controller for everything else.