This is also the place (I think) Friction has planned the new fee I talked earlier. Instead of having these "self escrows" or whatever, it would be required that an amout of IXCs needs to be transfered to a certain address (this is the "Mastercoin way"), i.e. "the Foundation fee". IMO, that's a good idea, but I wish he would discuss the fee amounts etc here instead of just putting whatever pleases him. IMO, the fees should be rather small (to encourage the use of IXC CP) and also rather simple (to prevent complications in the long term). My preferered way would be to have the amount send to Foundation to be exactly the same amount as paid to miners regardless of the CP action. This would be very easy to check from the implementation point of view (so easy that it could be easily implemented as native if needed) needing no adjustments in the future, and IMO it is also fair ("half to miners, half to the Foundation"). Also from the users's perspective, it would not be too expensive (double of making a normal IXC transfer).