Don't know how it will work with GT adventure mode, since there is no way to place blocks now.
Ahem, I already found a way to fix the Block placing thing. Just switch the Game Mode (silently), while the Player clicks with a Block in his Hand (there are already hooks for rightclicking). The larger Problem is that the Tools are not harvesting Blocks without NBT. That could be a Problem. But until then I will keep the GT Adventure Mode with the 1.7.4 Update.