I think that although it would be a nice feature it would not really carry its own weight. You should never depend on automatically determined trust values anyway when it comes to actual transactions, but instead check whether *you* trust the person.
If you use firefox then one thing that you could do would be to write a greasemonkey script that computes a trust list according to your specifications when you click a button. However, writing such scripts is not for the faint of heart
I'd write one for you (for a small amount of BTC
) but I don't have time right now or during the next two weeks or so, so maybe you find someone else who is willing and able to do it.
Onkel Paul