Good cause I had another idea while on the way home from work. We see that they have the ability to make a 'house' of sorts, so what if we made a new type of dewlling that only Mokuton users could access, it would be free for they to make, but cost 1-2 turns to put together, and they have a small house to stay in over night. There would be no coffers or extra keys etc... and it would be a once use house, that dissappears as soon as a new day comes. So that way they can still be attacked, but they ain't out in the fields, plus they can have a dwelling anywhere they want, just like a real Mokuton would actually do. And I know this is possible, well at least the part about making a type of dwelling for just one group, just not sure about making disappear at new day. So is this the kind of idea your looking for?