Well, the Echoes of the Beast trapping gives you a +1 anyways, so that's already built in.
As for avoiding ambushes, in some situations, I'd say that you just couldn't be ambused - not unless they're using magic to veil themselves.
Most ambushes need cover or darkness, so while others with conventional senses would be ambushed, the power would prevent that. Just like if someone were to be hiding in the dark getting ready to jump you, if you're character has a power that lets him see in the dark, they would just ignore that aspect.
Other ambushes could work...like people disguised to look harmless, or if they're far away enough or, as I've said already, if they use magic since magic veils all types of perception. But I'd still allow the +1 to perceive these some of these kinds of ambushes.