If I understand your question, with a wlf, you don't need to set film speed. You do that on the hand held meter. Transfer the meter readings (aperture and shutter speed) to the camera. If using an AE metered prism, you set the film speed on the prism. Hope this helps some.
Gerry
It confirms my thoughts. I was thinking you only need to tell the camera the film speed so it can accurately adjust the light meter. I set my light meter at 100asa which is what I am running and then set the aperture and shutter speed accordingly.
Thanks for the reply.