Quote: Will it ever be possible to have more than 4 textures? Is this an mdl limitation?
No, this is a directX limitation. On your terrain you have 8 textures (4 textures, 3 blendmaps, 1 shadowmap). So it with this FFP is won't be possible.
@Pappenheimer: Yes this is a solution. In earlier versions the cellsize was even smaller, I scale it 200%. But I can it make bigger in next update. Btw: the default scale of the terrain and the detailtextures is the normal size for the 3DGS templates (size of the guard etc...).