I had this idea like that if you have higher agility you will lose less stamina while running. But i also don't mean like that you can sprint through the forest without losing stamina with just 20 agility or something.
But maybe like:
10 Agility - The stamina loss when you run etc. is just the same as it is now
50 Agility - You don't lose any stamina with walking speed on forest land.
100 Agility - You don't even lose 1% stamina while running on stone ground and grassland.
150 (or 200) Agility - You can run through the forest losing very less stamina.
250 Agility - You can sprint on grassland and stone ground without losing stamina.
400 Agility - You can sprint on forest land not losing stamina.
Just for another use for agility.
Now it's only for crossroads and since the new update for fighting, right?