I don't quite understand how that works: you're looking for someone trusted so that you can send him/her a token (4 BTC) that will then be sent back to you (since the person is trusted and will not keep the token) and get a rating for that?
How would that rating mean anything?
It will state that I'm an active member on bitcointalk. (I did a couple of transaction here)
You can send 4 BTC to 1MXUDzPiHoqU4ZujhVNyJ3QPNbsotWMAxd and I'll repay you tomorrow to the address you indicate here. I would rate you with factual comment, i.e. "Lent me some BTC for 24 hours".