Posted by failure

I don't think that will work because it leads to intentional spamming of trade requests by players. Maybe if there was a once-a-day thing, or maybe an option to disable trade requests. But I like how the idea included gifting and trading at the same time.
In my opinion, Event Coin items, guns, and normal and buyable melees should not be tradable; only "rares", sellables, and auction items should be tradable.