A minor post restriction might not be that bad but figuring out what's reasonable is the problem. It's rather hard to keep up with a thread that moves 20+ pages a day if you have any amount of life at all, especially once you take time zones into consideration. I know back when I was in the game I had fairly large burst of inactivity, hence the reason I asked for someone to replace me but at the same time, I tried logging on and reading the thread only to find out I missed out on several pages worth of posting overnight.
I'd suggest a rather high limit to start off with and we can reduce it gradually as the games continue. Drastic changes alter things far too greatly for a game of this nature.