It's complicated because it has to be, otherwise, members on default trust have that trust on all quarters. One would need to be proven trustworthy on all points. Thus a person might also have a total trust rating.
But, I could also see it as something the new forum will not have, though it would be an upgrade in itself making the forum an even safer place.
In my opinion the default trust is the only problem with the trust system, other than that its perfectly good. Maybe default trust people shouldnt have so much power or maybe there shouldnt be ''trusted feedback'' or ''untrusted feedback'' but rather just feedback so people specially newbies would look at all the trust and not only the ''trusted feedback'' which could very well be wrong as it happened many times before.
I personally think default trust are for those who have some kind of maturity to their account or they've been here quite awhile to know everything.
Sure, you can get on for scam busting and gain that rep so very fast, but what if that's just all something they could use to their advantage to pull off a huge scam?
Otherwise, it should be for Moderators and higher only.
Temporary spots on Default trust for users who would be verified to be able to set something up like a group buy or service.