[Hamstar]

2. A "reverse trade" button would be an absolute and utter failure

I'd love to see what post you guys are reading that there's a magic button, or instant undo of all trades ever on a whim. I suggested an opportunity to reverse trades - a possible course of action that traders can go through, meeting certain strict requirements (which will exclude 90% of traders because none of them seem to have the power to read, rules or otherwise).
Given a formal process, with strict guidelines (e.g. proof something nefarious happened), with a team dedicated to security/trading policing, a trader could have an opportunity for it to be overturned. This can be further shored up by the team not acting independent of the community which is not Valve's usual thing. They can engage with SR, or some of the reputable members of the community for consulting.
The true biggest stumbling block is hiring multi language support. With Russia and LatAm being huge markets, it'd be in their interest to not ignore them.

I apologize for phrasing it that way. I just don't think Valve has the internal resources to deal with what comes down to bad trades. I mean, just imagine the further deluge of whiny trade reversal requests for stuff like, "I traded 2.44 ref for a key when I saw my friend get a key for 2 ref!"

It's just not in their best interest to start accepting requests like this.

As for sharks on these forums, we have and continue to discuss the issue and I'm going to leave it at that. Any official policy change will come form Pete or Me.

Thanks for the update.