Currently you have to put items into every specific slot in your trade window. I would like it to work more like merchants where you can essentially just drop your items in the window and it will automatically put it in starting from the top. Is this necessary? probably not I wouldn't expect this to be something that if implemented would take priority over other more urgent or fun stuff.
If it's possible, definitely support this. There's nothing nostalgic about having to strategically place your items when making a trade. Speeding up the process would save a lot of time in the long run.