At least by default, a keyboard on PS3 is always set to chat, so the normal sort of keybinds used on PC don't work with it. I believe, however, that there's an option available to select somewhere that makes the keyboard usable the way it is with PCs (with keybinds for actions). That might be necessary in order to make this feature work. When I get home, I'll take a look and see if I can find that option and whether it works or not.