Of course Fallout NV doesn't mix and max like that, but if you had a G.E.C.K. for the PS3 it would probably be similiar to Willowtree for switching data, like making a 9mm fire grenades or something like that, or maybe that data isn't in a Fallout NV save file, I'm not sure.
The Xbox version has a save game editor, PC gets the G.E.C.K., but the PS3, in order to add more fun with the editing and modding, needs a hacked PS3, which I'm not willing to do.