It just occurred to me that they best way (in my honest opinion) would be to make several rings around the characters ...
Like at least 4 lets say ...
Anyone more far than 20m would be able to sneak around without any fear.
In range 15-19m (45f cca? really dunno) ... the sneaking character would have to pass Difficiulty 5 Stealth check.
In range 10-14m (30-44f cca) ... the sneaking character would have to pass Dif. 10 Stealth check.
In range 5-9m (15-29f cca) ... Dif. 15 Stealth check.
And finaly in 0-5m (0-14f) ... DIf. 20
That way the closer you are, the harder it would be to sneak around ...
I only wonder if that isnt a little too much work for single ability.
