Well I don't think you really need to go that far. I don't think any one really cares about what the ground looks like, referring to bumps and such. You can just do it with a brush in an art program you have..such as GIMP and what not. It won't be the same but it still creates bumps. I don't think Kovu would want to add something like that, I don't know. But it would be a nice feature, anywho. More realistic-ish.
P.s: I might not even know what I'm talking about. xD
As for the pixel shading, thumbs up