I haven't put much thought into it, but something that might at least be acceptable would be to let anyone register as an "accreditor", and give them the ability to have their "seal of approval" or whatever added to threads.
I am already envisaging armies of alt accounts all slapping their worthless stamp on each and every project in return for payment, much like a the current bumping services which exist. I struggle to see how such a system would work though - I very much doubt any senior or trustworthy members (the ones whose seal of approval you would actually care about) would be willing to spend a significant amount of time investigating and then risk their reputation for someone else's benefit, especially when the vast majority of ICOs turn out to be scams.
