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I just downloaded RepG 40 - Sailfish r003 for the Mac and Extruder Hold is still there.  It's on the "misc" tab, left hand column, under "platform preheat & override temperture".  You will only see it if your machine definition is for "makerbot4gsailfish" and the bot reports a firmware of 4.0 or later.

Since I built those RepG 40 - Sailfish packages, I'm confident that they are all the same source.  The Windows and Linux versions should be no different.