1) Good idea but it should be restricted to certain sections only.
2) I prefer to offer 2 alternatives :
First one : ICO don't pay anything but the manager has to open a self-moderated topic and like the wall observer topic, all reports go to the manager and he is obliged to remove the spam or else the topic will get trashed.
Second option : ICOs have to pay a fee that goes to the forum mods to clean the spam out of the forums.
Point number 2, first alternative:
It will never happen. Some ICOs will pay the bumping service (reading the forum is around 50$) to bump their treads, I cant see how the manager can ever report the spam on own thread, more views, more clicks, more google researchs -> more money for bounty manager.
No self-moderated topic = trash can directly + OP ban.
No moderation to the self-moderated topic = trash can directly + OP ban + ICO prohibition on bitcointalk.