Traps can play an important role in ranger ; rogue roleplay but it can be abused easily. A strong trap crafted and set is hard to detect and can outright murder people (especially a lighting trap) without roleplay giving much pain.
But with such, ambushes are indeed possible, opening up highwayman rp, enriching assasin rp, hunting rp and so on.
Something have to be figured out though to avoid the abuse. Like player set traps won't kill but knock out others, to 0 hp.