thaddeus: yes on both counts! the wiring of the bridge pup to a tone control is a common mod, as is the one where all 3 pups are wired to one tone control, and the other tone control is used as a blend pot to blend in the neck pup when in the bridge position or bridge pup when in the neck position (and to activate all 3 pups in the in-betweens) - i like this mod a lot, as neck + bridge gives a nice thick tone which is great for rhythms and leads too.
http://www.acmeguitarworks.com/BLENDER_WIRING_C138.cfm
Whitestrat: my theory is that the JP 57/62s could be MIJ but wound with the same specs as the US CS 57/62, or directly mass produced by US and imported by Fender JP for use in their guitars. Both seem feasible as the equipped with "US pickups" tag is a nice selling point especially considering the reputation of JP guitars has been tainted with the "cheap electronics" bugbear which still persists to this day. Plus with economies of scale, it might be cheaper to mass produce pickups in US than to devote a factory in JP to do so, and just ride on the lower costs of shipping in bulk to JP, since Fender US will be sending far more than just pups in each cargo shipment.
Either way, Fender JP is under license by Fender USA - they may be prevented under contract from marketing the JP pups as a CS 57/62 as it might somehow diminish the perception / value of the CS 57/62 if it was associated with what's put in a "cheaper" CIJ model, especially since only the CS Fenders come with that. Plus, Fender makes a healthy markup on aftermarket pickups market, so why mess with that by saying a stock JP guitar comes with pickups that's supposedly one of your higher end models (and which no doubt, a lot of buyers of Fender mexican guitars buy in the aftermarket, thus threatening their primary market with JP imports)?
If anyone has both sets, why not measure the pickup's output resistance/impedence for both the JP and CS pups, that might help clear the air once and for all!