Until someone mods a controller for the 3, no. The console has the capability, the games do not. There is a mod controller for the 360 that allows for a keyboard plugin.
PC > Consoles for shooters. But I'm sure someone's about to tell me how wrong I am.
You can use a mouse/keyboard for Unreal Tournament 3 for PS3 iirc. I know there is something that's similar to and keyboad (SplitFish Gameware <---- this), but I have no idea how well it works.
EDIT: The site also doesn't list the dpi of the mouse.