Guild Wars 2

I think you should be able to favorite certain items in the backpack to prevent accidental selling/salvaging/destroying.

I agree, I prefer this to putting items in the invisible bag. LotRO has this feature (maybe other MMOs too, I don’t know), you can lock items so you don’t accidentally sell them.

This would be nice to have. I use dungeon armor and karma/WvW gear because they won’t appear in a sell list at all. The buyback option for the merchant somewhat mitigates this problem if you realize it soon enough, but I’d want a way to lock items so they don’t get sold/salvaged/destroyed by accident.