All of what you're suggesting has been proposed in the past, but at this point I'd rather just keep them quarantined in the off topic section than them infecting any where else as you'll just get them shitposting wherever is easiest for them and they'll move from board to board until there's none left. The problem again comes down to shoddy signature campaign managers who don't really care where someone is posting or about the quality of those posts. If people are abusing the off topic section or anywhere else and there's specific campaigns that are paying them for this then they should be dealt with. People can make decent posts in there but the whole reason it's become a cesspool is because of the few campaigns that are allowing themselves to be abused so they should be dealt with if they're causing a problem.
OK, let them spam the Off topic, but shall I continue reporting posts abd threads there? If I continue doing so and there is no moderator assigned to the section I just keep the global mods busy with all the usless crap that was posted there? I think we need at least a own section mod.
The business in developing accounts there is dying so I suspect that all that shitposting will end soon.
You can report whatever you wish and the globals will either handle it or not. I tend to avoid reports on sig spam but it looks like someone is handling them at least. As for more mods, I think all big sub boards should probably have their own dedicated one but only theymos can assign them. Farming has pretty much died out now after the implementation or the merit system so there's not much good in just building up your account merely with a high volume of posts in off topic as without the merit you'll just be stuck as a lower rank forever.