This only works if all of your phones share a common configuration, correct?
I.e., Take two 7965's for example, where one phone has a PBT of 1 Line 5 Speed and then other is 2 Line 4 Speed. You would have to have two phone templates and two different BAT jobs. One with a new PBT of 1 Line 1 SURL 3 Speed and one with 2 Line 1 SURL 2 Speed.
That's just one small example. What if you had the new fancy Invididual PBT on your phones? Now you have no idea what to "reset" the PBT to.