I don't think roads speeding up plains is necessary. The whole point of (non-enchanted) road is to make a smooth standard pathway. You may walk a little faster on a road compared to an open grassland, but it wouldn't be by much. If anything I'd say the movement through the desert should be higher. Walking on shifting sand and heat is rough.
As for the roads/dwarves thing I was just hoping it would be possible to remove enchanted roads from myrror and allow dwarves to build them, which would then help them on their home plane, but impossible is impossible.
As for the roads/dwarves thing I was just hoping it would be possible to remove enchanted roads from myrror and allow dwarves to build them, which would then help them on their home plane, but impossible is impossible.