One goal for the future is a full-out scenario designer, but I don't think that savegame editing is going to be particularly a great stopgap. For one, it's infinitely abusable, and for another the format is fairly nontrivial in terms of including a lot of variables and functionality that would have to also be explained in terms of allowable ranges, purposes, and varied usages. And there are several blocks that are compressed, to make it even worse, so you have to have just the right decompression algorithm as well as the knowledge of all the (ever-changing) parts of the game itself. To me, at the moment it seems a can of worms, and it would be far easier to eventually just create a scenario editor instead.