Firstly, it's a good policy to pinpoint a suggestion or two rather than post lists. That way it's easier to find, read and discuss these things.
1) Agricultural help from companions.
I recently was harvesting my herb patches and I had a companion. As I cut down the nettles, I wished I could ask him to either thresh the plants behind me or pick them up for me. It would make agricultural fields a lot more easier to manage and maybe even I could ask him to sow seeds for me in the spring if I gave him the seeds and harvest/thresh if I give them a grain flail.
Yep. The ways that companions can help out the player character need to keep increasing. And this surely should be included.
Putting branches in an ice hole to help delay refreezing.
This would be an interesting trivial addition. It immediately comes to mind where to find data about how much this should delay the freezing.
Player characters shouldn't start with perfect knowledge of traps.
Agreed. And player characters shouldn't start with perfect knowledge of all the other crafts and constructions either. It would suit the game world perfectly is if things needed to be learned gradually and in more culturally dependant fashion.
Snakes should drop fangs/teeth. Maybe could be a spell component. A Sage request item?
Would be nice little detail, among many others. We'll see if a proper in-game context comes in our way at some point.
Trading with different types of people should mean what items you trade with should have different values.
Yep. This is the trading direction we'll turn to at some point. The timing can't be predicted, though. It needs detailed planning and some unhurried time to concentrate on trading as a whole.