4th Edition Rules - comment now or forever shut yer trap!

[Hugmenot]

Movement Costs
If mechanized units were to pay 1 movement point per clear hex, it would double their effective speed in clear terrain.

If mechanized units were to pay 1 1/2 movement point per clear hex,

• mechanized units with a movement allowance of 3 could move 2 clear hexes instead of one (100% increase)
  
• mechanized units with a movement allowance of 4 would still be able to move 2 (0% increase)
  
• mechanized units with a movement allowance of 5 could move 3 clear hexes instead of 2 (50% increase)
  
• mechanized units with a movement allowance of 6 could move 4 clear hexes instead of 3 (33% increase)
  
• mechanized units with a movement allowance of 7 could move 4 clear hexes instead of 3 (33% increase)
  
• mechanized units with a movement allowance of 8 could move 5 clear hexes instead of 4 (25% increase)
  
• mechanized units with a movement allowance of 9 could move 6 clear hexes instead of 4 (50% increase)
  
• mechanized units with a movement allowance of 10 could move 6 clear hexes instead of 5 (20% increase)
  
• mechanized units with a movement allowance of 11 could move 7 clear hexes instead of 4 (40% increase)
  
• mechanized units with a movement allowance of 12 could move 8 clear hexes instead of 6 (33% increase)
  
• mechanized units with a movement allowance of 14 could move 9 clear hexes instead of 7 (29% increase)
  

Now my question for existing scenario designers/developers is how much a factor was movement allowance was when trying to determine the scenario length? The above may or may not be a big issue, and maybe even less so if the new value was 1 2/3.