This thread has convinced me to do some research and customize my trust list after relying on the default trust list for as long as I have been here. This will probably take a long time to sort of think up though as a I think there is a lot to consider when designing your trust list. I'm in disagreement with a lot of the options in the poll and I would like to explain why. I have selected the "something else" option.
Some one with whom you've concluded a successful trade (goods or services)
This option makes sense at a face value right? because you trust them due to the successful trade that you guys have had. But that is not what the custom trust list is for. You should not be including members that you have trading with instead your trust list should be including people who leave trust ratings that you agree on and are valid.
Campaign manager that doesn't allow spammers
This option actually annoys me because if you are including campaign managers on your list for excluding spammers then thats ridiculous. This should not be something that someone is praised for but expected to do. Campaign managers should be one of the highest reporters on the forum in my opinion because there's so many spammers in their campaigns and they are required to review every post. Why not report the post too?
Campaign manager that pays on time
Again this is ridiculous. Just because someone is releasing money that they are being PAID FOR does not benefit the forum by including them in your trust list and probably is not going to benefit you. Unless you think that including them in your trust list will get you into their campaign. You can leave a rating if you would like because you see them being trustworthy and actually paying but not include them in your trust list.
Someone who demonstrates good judgement of character
If this means judgement of other members on the forum then I would agree with including them in your trust list if they are actively leaving trust ratings and not just voicing their concerns. We need people with good judgement of character who are actively leaving ratings on the forum.
Someone who's historically demonstrated trustworthy behavior
Kind of agree although I think a positive rating would be better here. If they are again leaving ratings which are accurate then I would agree that this option is a valid reason.
Some who leaves accurate negative reviews (scam-buster)
Yes, yes, a thousand times yes. This is THE person you want to include because they are not only actively making accurate ratings they are actively scam busting which means they are probably looking into each case in incredible depth.
Someone who's already on DT1
Someone who's currently not on DT1
Just no.
Someone who's earned a lot of merit
Merit has no relation with trust what so ever.
Someone who frequents the same local board as you
This option makes sense only if they are actively leaving trust ratings which are accurate in the local board.
Overall it all boils down to whether they are leaving good accurate trust ratings that you trust to be accurate. If they are not then its probably a better idea to show your appreciation or thoughts via a neutral or positive rating rather than including them on your trust list.