I seem to have done a bit of work on this a couple of years ago - part of the problem with the older ToD files was the proportions of direct vs ambient light was way off, which messed up shadows. Given RW didn't have projected shadows originally that's not a major surprise though.
If anyone wants the ToD file I used here as a base for something to work from, I attached it.
https://www.youtube.com/watch?v=5BtPC2BEYUASet up for the UK so you'd need to edit azimuth angle ( which is not apparently solar azimuth, it's gunlaying azimuth! ) and dawn/dusk times. Note also that the sun & moon turn on/off instantly, so don't go mad with direct moonlight... ( that was RW3/TS2012, not tried it with the latest one ). You'll also need to sort out your own sun/moon/skybox given this was in the B-E route.