Edit: Oops, it looks like there is a way to scale the terrain itself, though it doesn't scale the other GS entities on the terrain in relation to the terrain.

Will it ever be possible to have more than 4 textures?

Is this an mdl limitation?

Undo would be good. I would like to be able to rotate some of the textures on certain areas, to mix up the look. And Up/Down keys to navigate vertically would be nice (or is this undocumented?)