As for Lightstepper, I happen to have a saved game point at a location in Cyseal where there is a hidden gem that can't be seen (even if you're right on top of it) unless your perception score is high enough. I have unspent talent and attribute points on that save. When I raise my perception up, I immediately discover the hidden gem. If I instead reload and put points into Lightstepper, I still immediately discover the hidden gem. So, both methods will aid in discovering secrets (and not just traps).
Interesting
Question: does this mean both of them stack? high perc + lightstepped = gold digger : P
