Bushes should have some kind of a purpose in the game besides annoying things in the way. I think that they should be used for hunting so someone can such the bushes for wild berries or for small animals like rabbits and foxes. Also maybe they should sometimes have wild seeds on them or you can use the bushes to lure pray.
This idea would bring hunting and gathering to a whole new level but it shouldent be really easy to lure animals and to find the seeds. There should be a challange to it also.