I've taken the liberty of creating a config to make the new treecapitator work with the default block and itemids in the Feed The Beast magic world pack.
Please don't hand this over to the Tekkit team, the FTB is more up to date and more respectful of the mod devs than the Tekkit team...just my two cents
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You can grab it at https://dl.dropbox.com/u/75343/treecapitator/TreeCapitator.cfg