Idea: Combine items in trade offer inventory and make it easier to add multiple items

[skomski]

I often trade more then 100+ items/keys and it is really horrible to click on every single key. It would be great if it could combine the items like in the normal inventory and handle the work to add multiple keys to the offer. Maybe I send a pull request in next few days.

[skomski]

I wrote a quick and dirty script for it yesterday: http://userscripts.org/scripts/review/391088