Again, it is not for someone to define it, it is the information which Dev/Thread starter has to fill and it should include all required data, thats why I suggested at all to elaborate it with a dev.
If I make an ANN thread, during creation of my post I need to fill this data, lets say I've written everything. Then I ask you to check (if it is not checked already). After you check if it complies with rules and requested information, thread is unlocked. The same would be for missing info, you would point me that some requested data is missing and after I add it, thread will be marked as checked and ok.
That's it, its not a check if something is scam or not but in many cases scam will become much faster visible if it has to be checked by moderation. It does not produce you any additional work at all and I still can't see how it can be missused except that mod marks it differently then it is, in this case higher appeal helps, but currently you have much worse situation as mods do use their power for specific agenda.
Again, it is not about saying scam or not.
The OP is entirely about having moderators check to see if its trustworthy or a scam. What could go wrong, is there would be a huge margin for abuse. Someone could very easily promote their own financial interests by vetting something that shouldn't be, and not vetting something that should be. An alternative, is that no coins meet standards due to anti alt coin stances. Not only would it take a disproportionate amount of staff resources, but it would also require setting new rules for what is/isn't acceptable for a section that isn't the forum's main focus.
Similar proposals have been made before, but its always been a bad idea. What makes a coin trustworthy or not in the forum's opinion is whether it is a malware or not. All other negatives you might associate with alt coins ( Pump and Dump, ICOs, etc) are all characteristics of the developers and userbase, it has nothing to do with the technology.
Frankly speaking, the alt coin section isn't one that is really catered to here. It took me over a year just to get the subsections that exist now. We even encourage people to make their own alt coin forums, because Bitcointalk isn't really an appropriate place for in depth discussion surrounding all facets of an alt crypto ecosystem.