Foraging changes and enchantments

So, I finally decided to get off my lazy ass and do something:
1). Foraging chance based on your survival skill and perception.
2). Maximum survival skill attainable through foraging is calculated using intelligence.
3). Forage for mushrooms and bird/reptile eggs.
4). Trash - one of the greatest and numerous treasures of humanity, is now "foragable", alongside other food items.

Possible features (if, I am not too lazy or incompetent to do them):
O). Scratches, rashes and other accidents.
O). Snakes and other (giant) vermin hiding in bushes? Surprise bites and poisonings?
O). Eggs of giant insects/mutants as time goes on?
O). More trash items?

Discuss and suggest.