My current group is on a journey that will take them through hundreds of miles of forest. The SRD helpfully lists overland movement modifiers by terrain. My question, not covered by SRD, is: does having a modicum of expertise in the Survival skill (and/or Track feat) warrant reducing movement penalties? Have any of you any experience with house rules regarding such?
For example, the group will have to travel through approx. 250 miles of forested hills with no trails or roads to follow (let's be nice and say 240, since it divides easier). Since each terrain type is x1/2 daily overland movement total, and combined terrains multiply all penalties, it would take (240 miles / (1/2 x 1/2 x 24 miles/day)= 40 days of travel.
It seems to me that someone skilled in wilderness survival might be able to reduce that duration (or more appropriately, reduce the penalty over a certain period?) by picking out better paths/easier paths than someone just blundering around with no skill whatsoever.