The FPP option is only available to certain (government) customers. It was developed primarly for the US Forest Service for wildland fires.
Other than that, with all the available channels in radio's these days, there isn't a real need for it, other than having something to play with.
Prior to that, the JT1000 was FPP with a special key needed, and the 1550 with the programming battery.
FCC rules dicitate that FPP type of programming features must be restricted in nature...mostly in part to prevent people from screwing around with them. Its part of the type acceptance procedure.
Again, you need to provide more information in what your going to do with it.
The GP2000, PRO9150, GP68 are non-US radio's and you will not get any support for them if they fail (and by the rules-not legal for commerical/public safety use in the US).
The only thing you can change with the JT1000 is freq and PL. There is a little procedure in doing it, and take a min or two to change channel information.