Repeat individual faces of UV mapped cube for tiling

I have following problem: I have a cube with different images for top, bottom and sides all side to side on one texture. Everything is UV mapped and works fine except now I need to be able to scale the cube in any direction any multiple of the start scaling with the individual faces being repeated instead of stretched.

Problem is: when changing the repeat attribute of the material it pastes the whole texture under /next to the original and thus the top face gets textures for top and side, side gets part of side & bottom etc, when scaling to x or z 2*.

Is it possible to make Unity repeat the assigned parts of the texture individually or is there an alternative except using multiple textures & materials?