Dual-pivots are definitely nice on the front, but perhaps overkill on the rear wheel, which is much easier to lock up anyway. I like how Campy bucked the trend and kept SPs in the rear for a while. (Not sure if they still do or succumbed.)

Just out of curiosity, would it be possible to mount a clamp-on FD under the braze-on tab, or is there not enough room? I've never owned a bike with a braze-on tab.