A balance might be to allow stacking for 1upt of each type. For example: 1 Infantry Type (2 legs), 1 Ranged Type, 1 Mobile (4 legs/wheels) Type could all be on the same tile. Of course an Air type could fly overhead as well. And that would limit the SOD issue and the "tactical" aspect. Although I could see where EVERYONE now moves around with a semi set "stack". oh well, just an idea.