There are limits to what can be keybound on PS3. Everything that you can keybind is available by navigating to Keybind under the system menu in the pause screen. I believe that if you cannot find what you want to bind there you cannot do it on PS3. One definite is that you cannot launch actions or macros from the keyboard, only system actions and things like movement. Sadly PS3 is locked out from the full keyboard support available to PC and PS4 players.