I don't want this issue passed off, the amount of substitutions and prodding is ridiculous. The difference between this and other forum concerns is that something can be done about this. I think warnings and a blacklist are the best solution.
Technically inactivity can be given a warning under Forum Specific Rule, and I'd like it if this started happening. A 1-point warning won't kill anyone, but it'll be enough to make people seriously consider their actions on the forum. The issue with warnings is that it would be troublesome for the moderators :(
A blacklist for Circus Maximus is the most practical way of preventing inactivity, especially repeat offenses. It should be collective of all game offenses, not just inactivity (deadtalking, game hopping, etc). Obviously you wouldn't be listed for your first offense unless it was major (game-ruining major), but without some kind of negative incentive there are just some people that don't care if they mess things up for everyone else, and they'll continue to do it.