I'm afraid it would result in zero trade volume, because people would do the smart thing and sell ridiculously high and buy super low. No orders would match up, the spread would be crazy.
A midprice ? I don't think your customers will be very happy if their order executes at a sell price 4x lower then they intended, for example.
Sorry I have nothing more positive to say, except that it's a novel idea
Fair points. The scenario's I was considering were more for large one off movements of coins, dark liquidity dealers, larger traders and investors swapping chunks of assets or clearing out portions of their holdings and so forth.
One clarification, the mid price would be the other way, where orders overlap say buy at 5 and sell at 3, so price would be 4.