They could have used a d6 and gotten the same results.
You would have one red shield, one blue shield, one green shield, a flag, a valor, and a miss
You would just have to play that a red shield hits red, blue, and green units a blue shield hits blue and green units and a green shield just hits green units. This still equals 4 sides hitting green units (as long as you hit on valor symbols) 3 sides hitting blue units and 2 sides hitting red.
This would make things die a bit quicker but I think it might be interesting to try. I find it very frustrating when heavy armor units take more hits because they are wearing heavy armor. Also it's very difficult for a foot unit to do any damage to a cavalry units. This brings the chance of a foot unit hitting a cavalry unit with one dice from 12.5% to 16.7%
The only problem is that it makes green units even more fragile.
Has anyone tried anything like this?