If you would travel high distances it would be useful, like using either autopilot or timedrive, at 64x and 100 m/s it takes you like 128 min. (2 real min.) to travel about just 700 km, which in terms of planets is not a great distance.
The problem is that you would need to cut maps for the earth in half and half, for day and night in different time sets, and you could make as muchs as you want to use, you can later use the texture change option in FRED2, that's ok between missions, but in mission it would need to be dynamic.
The clouds also rotate at different speed than the earth itself, the one I posted above is modeled to do so, since surface and cloud maps should be separated models/maps and each one with it's own axis rotation speed.