I don't know that I'm really a Silver Surfer fan (I've never owned or read any of the standalone SS mags) but I think some of the best FF issues have featured SS.
The REAL SS (not one that would be romantically interested in Sue, but a mysterious harbinger of Doom) could be the key element of a great film if done right (and this synopsis sounds pretty good to me).
I think you and I want the same thing for different reasons. I want SS to be used sparingly because I want the character to maintain his power and mystery.
From what I've seen you post, (please correct me if I'm mis-interpretting) you want the Surfer to be used sparingly so that this will be a(n) FF film rather than a(n) SS film.
Based on this synopsis, I feel more confident than I have that you and I might both get our wish.