Yeah, iCraft is terribly prone to errors, probably why more people don't use it. I tried it for a day, and found it unworkable because of so many errors in map loading and such.
It seems likely that MCsharp(much more stable, easier to install, better interface) might have copy paste in its next revision (which will be called "Crafted"). Mind you, I have no authority to say this, I'm just postulating.
Ax7, which should come out in a while will also have copy/paste.
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