How about just keeping it like this + put there disclaimer only time range like 7:00..19:30 is reasonably finished and "officially recommended", and the rest is unfinished work-in-progress... Then with some patch every now and then you can somewhat improve it and get the cheering (probably would last for quite some patches) and create the feel of good progress... (and meanwhile check again what is precisely blocking the new tires physics from release and how to get it finally out)