Xalky,
No, you can't run your water cooled torch under 200 amps as air cooled! That's a good way to burn up your torch. Bad info on this one.
Paulie,
Running your torch this way is a time honored method. It works and is fine...and has been done this way for years.
As far as the 256's go, the new ones have the receptacle in the back. The older models had a CNC plug briefly (not sure why or how or who...) but it was a stupid thing as these units not designed for heavy use for CNC) and when they were carrying it, there wasn't enough space. ONCE we took out the CNC port, there was enough room, so a few units in 2012 may have had the PowerPlug.
The 2013 manual clearly shows the plug. No need for an update for that reason.