I made a feat before (daily punch 1-18-13 http://wp.me/p2Gk5z-6o) that added to the range you could fail a check without something really bad happening, here is a different idea. Before I thought about adding a static +3 to the range , may be a better idea would be to add your ability modifier to the range to reflect your innate ability?
Here is a feat for 4th Edition DnD, Arcanis, DnD Next, and Pathfinder:
Careful climber-feat- instead of failing and falling off a wall if you fail by 5 or more, you fail and fall off a wall if you fail by 5 + your strength modifier. If you fail by less then that amount, you make no progress that round.
Thoughts? Is this better then the other idea?