It would be more convenient for bulk traders to allow the following feature

1) A button in the trade screen which would automatically populate each side of the trade with cards as follows
a) I get cards from your trade list that are on my wish list
b) You get cards from my trade list that are on your wish list

Yes, initially the trade would likely be very unbalanced. But it's a lot easier to remove cards from a trade than it is to add them currently.

I personally have a very large wish list which is only going to get larger (basically, if I don't have a playset of that card, whatever I need to get to a playset will be on my wishlist)

This this this. Oh please god this.
I trade in bulk as well, and holy hell is it excruciating to add cards 1 at a time, while also having the necessity of having my wishlist and my trade partner's wishlist open in 2 more windows. :(