NeverMind
Proud to be Russian
Well, nice idea, JohnYoga! 
But take a look at a reference in the 1st post. You'll see 4x differences between standard Quick and Marathon speeds. And no unit movement changes as you know.
Anyway, you can change units movement, if you wish, and test the results. Use iMoves tag in CIV4UnitInfos.xml. I would recommend ~1,5-2x. Not an easy task to get it balanced.

But take a look at a reference in the 1st post. You'll see 4x differences between standard Quick and Marathon speeds. And no unit movement changes as you know.
Anyway, you can change units movement, if you wish, and test the results. Use iMoves tag in CIV4UnitInfos.xml. I would recommend ~1,5-2x. Not an easy task to get it balanced.
