Try changing turtle_fakeplayer_method=perturtle to turtle_fakeplayer_method=single or turtle_fakeplayer_method=off.
You can find this in your ccturtle cofig file (look for the config file or mod_computercraft “CC”).
Then give rights to the user [ComputerCraft], or just /op [ComputerCraft]. Keep in mind that when Buildcraft or computercraft is oped it can modify blocks on anyones claims (including spawn). So you should figure out how to give the mod rights directly i.e. builder or member.