Nice feedback Paw.

1) I think a remap button after you press avatar is OK, but IMO, having one above the pet aa button or the potential pet swap button would be nice too. I hardly ever click pet aa etc. on accident. By duel and trade, do you mean when you click players? You can disable context menus in maps to prevent that from happening already.
2) This is a valid concern, but a possible solution is settings for players to restrict trade requests. I.e. amount of gold, type of item, etc. I doubt spam from lowball would be that rampant since they would need to log on diff accounts for it to matter. I don't think many people will bother, and regardless, people can just reject all the trade requests with a simple click (it takes the lowballers more effort to make the request than for the player to reject it).
3) Ty
4) Ty
5) Ikr
6) True, this is the least relevant IMO, but would still be nice.

In regards to your other suggestion, I thought of that as well. I'll probably edit the OP with that idea included