What you're proposing just gives a higher work load for forum moderators, if they have to check hundreds of threads on complience.
Wouldn't it be easier to require them to buy advertising on the forum? That way Bitcointalk actually benefits from the many ICO-threads, while it proves dedication to their project. And since likely scams aren't allowed to advertise, they're instantly filtered out.
Very good point as well. I like your solution. Then I think if more legitimate projects are then announcing on the threads, they'll show work or proof of why they're investing work and time into their projects. They'll actually be selling themselves. Your solution would certainly help a lot I think, and Bitcointalk would happier too with some extra revenue coming in.