Splint, I looked through the two Electro-Craft Catalogs, which by-the-way have a whole raft of info. on motor sizing etc. And It would appear that the Pulse current or Peak current is a value that should be used in sizing the amplifiers, amplifiers are usually rated in continuous and peak current and this peak value allows for very momentary current peaks, which normally would not harm the motor or the amplifier.
Most amplifiers have a max current setting on them, and will shut down when this value is reached, they should be set to at, or just above the continuous rating of the motor.
Power supplies, should be sized with a good margin should be based on the total continuous current for all the axis. Power supplies usually have components in them which have more tolerance to overload for short periods. The bottom line is the motors and amplifiers should be protected from operating much more than the continuous current, by setting as above, and suitable fusing in the power supply. This is method has worked for me in the past.