I stumbled across an article a few of us have probably aready read, and there are some interesting paragraphs in particular that I believe would be great additions to jmonkey.
The article: http://udn.epicgames.com/Three/TerrainAdvancedTextures.html
My points in particular:
- Multi-UV Mixing: Reducing tiling through scalar mixing
- Random Tiling Masks: Randomize the texture mapping to reduce tiling
Whilst we could argue that the second point is trivial enough to implement by yourself, I think being able to make use of these tricks “out of the box” would be a pleasing addition to combat monotonous terrain and would be used by the majority of users, not just a specific set of us. The screenshots in the article are proof enough that these little tricks of the trade can make a very pleasing difference to what was an obvious tile.