Here's a "Hmmmmm!" thought for you.

[plloyd1010]

As with any special rules, you need to think about game play effects. Not that that is bad, but you might need to make allowances, especially for when reinforcements arrive and enter the battle by cross-country movement.  The Crossing at Alytus was my biggest wake up call, though there are others. In the other hand, mechanized 1 MP per hex doesn't effect on board setups much and does allow for a more fluid battle.