I think Mystimoods is limited in tile texture quantity.

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My terrain shaders use:
a base colormap (24bit)
max. 7 tiled textures (32b, blending on alpha)
a static lightmap.

the base colormap is used by water mirror view, and to decrease repetitivness of tiled textures, and its blending strength can be adjusted. if no lightmap, no problem, there are 2 pixel shaders to handle it automatically. if less tiled textures are set, no problem too, it works fine.