Thought I'd try starting up a discussion here.
Now that I read the write up more, two things stand out:
One is that every token placed on it should be the result of some action performed by you (at least, and can include other PCs or maybe NPCs you control—especially for support/oppose tokens). Information, or "influencing opinion" seems to be +gossip, that may eventually turn into a +flag.
Given how support/oppose tokens work to resolving the plot, and even how color tokens are used, it seems that GM (staff or player) consent should be needed to attach tokens. I think that it should take negotiation and consent to have the plot progress (or not). Perhaps every token placed on the flagpole needs a signature by the Author of the root token? That might be easier to check than having some approval handshake commands.