The problem is who will supervise these frozen deposits？I don't think this is what Bitcointalk staff should do. As a Bitcointalk staff, their job is to ensure the clean and order of the forum Instead of being custodians.
What about the trusted users here who offer escrow services? There are a lot of users available with DT2 or higher. The big three (Monbux, Tomatocage & OgNasty) have built quite a bit of reputation for themselves. And then there are others such as SebastianJu and PsychoticBoy.