Well, it's about optimazed build, that sounds a bit munchkin (and really is), but I want to know max Perception number to see all hidden stuff in game, like that little shop in Rail Crossing.
Also it would be nice, if all sources of Percepton will be added too, because first without second will be useless.
If some sources have spoilerific nature, add it like "spoiler source 1, spoiler source 2" etc.
Right now I know about (except obvious Snooping feat):
Junkyard Surprise +2
Gogles +1
Anything else?
P.S. If it's too much for forum, let me know it.