Maybe add a time limit between posts? The English AVA general forum has been getting spammed constantly the last couple of weeks and it's because there's basically no time limit between posts. One can do something so easy and just hold enter to spam tons of junk threads. I'm sure that there is an option in the admin control panel in the member groups section, forum edit section, or somewhere similar.
I suggest 30 seconds.
Active posters may feel that this might be an annoyance but admin/mods can't be around 24/7 and this is why the English AVA forums and possibly other forums are getting spammed on a daily basis.
Example of what I mean:
but imagine 2-3x that per page and going on for 40+ more pages.